Great tour. - Had a great time on the hop on hop off buses listening to the information about the city. Each tour was about 2 hours though so some of the longest I've done. I only wish I'd paid for the 48 hour pass.

Great way to see the city - The hop on hop off bus is always a great way to get an overview of the city you are visiting. We enjoyed this.

Best 24 hours I spent in Vienna - It twas fitting perfectly my schedule - we really enjoyed the flexibility and information provided with all options and variety of visited locations

Great way to see the highlights - I love the hop-on hop-off buses because you get a tour as well as transportation. it's always the first thing we do when we go to a city for the first time. Gives a great overview then convenient transportation to where you want to get off and explore more. The only reason I'm not giving this 5 stars is that we bought a deluxe ticket that included a nighttime tour of the city. It would have been great had the interior lights been turned off, but all we saw the whole time were our own reflections.

Quick and easy bus tour in Vienna - 1h30m - 1h50m on the bus routes are good for anyone who would love a quick sightseeing tour of Vienna. It’s just so easy, and the audio provided was really cool too, with classical music background and occasional Austrian music. It was a pleasant bus ride. I wish the bus comes more frequently though, although it may not be economical.

Great way to spend 48 hours - Liked the convenience of getting off and on the bus. Sometimes a bit difficult to find the bus stop and especially the one to get to the river cruise. But the river cruise was the highlight of the tour. We especially loved experiencing the boat going through the locks in the river.

Would not do it again - It was not helpful. There was little direction have done. I have done it in other places and liked it.

One of my worst Big Bus tour experiences - The agent was not to be seen for an hour plus. I tried to contact through Viator aap and no response. Walked an hour to get to next Big Bus tour office. We got the last bus and only could do one route.

Dreadful - While I love hop on hop off buses, this one was terrible! Unless you don’t hop on hop off , there is no way you can enjoy this messy service! I bought a 48hr pass because it was the only one offering a Danube river cruise ! I stayed only 2 days in Vienna and the schedule was very tight . It was first time in Vienna and we came all the way from Australia! Due to the short stay we decided to buy this pass although we had another trip booked for Schonbrunn palace. The pass offered two trips ( red route ( city) and blue route ( castle route) as well as a Danube cruise & walk-in tour. It felt like good value for money ($200) although we had no need of the blue route. First day we had a lovely walking tour of the city centre … and the pleasant experience ended there! When we boarded the bus , my digital ticket was replaced by yellow tickets. I was told those were the tickets to use for the rest of the trips . We boarded the bus and nobody handed us headsets or explained where to find them . We had to figure out the earbuds were packed and available in a basket next to the driver. We missed on a couple of information but we said ok. Next , we hopped off wanting to visit something and then we couldn’t use the app ( the more you zoom on the map the smaller the signs ) so good luck to those wearing reading glasses. We couldn’t see when the next bus was about to come , the app is non intuitive and also freezes. The bus stops are rarely marked in this company colours/logos . We used Big Bus’ paper maps and, to our surprise, we found a bus turning left before reaching the bus stop, leaving us freezing in the middle of the road ( totally not cool ) . There was no return route at the Museums station so it was clearly the bus we were waiting for ! We decided on taking the red route to go to the Danube cruise. Although we discussed with Big Bus’s reps about our cruise, none of them told us we had to change the yellow tickets again (!) . Also, Nobody told us there were no Danube cruises in winter! We discovered (written on the ticket ) that we had to change the ticket for a DSSG ticket , at one of their stations - Blue Danube. I asked Big Bus via their chat( through their mobile app). I got no answer while I was in the bus heading there! Then the answer was like “ yes you must exchange tickets at DSSG - but without indicating WHERE that office was although my question was clear and simple(as if we were supposed to know who DSSG was). Before hopping off, we asked the driver who shook his shoulders as if he had no idea. ( Note: Their drivers speak no English, have an attitude and are totally unhelpful..so you are on your own !) We were left at Blue Danube stop pier3 with no clue about what we were supposed to do. There were 6degrees and it started to rain . We kept walking and found a DSSG office. The lady there explained there were no river cruises in winter! The only cruise was on a canal not the river (the grafitti canal) and their office was 40 min away on foot ( we couldn’t arrive on time)! This was so not what they advertised!! It took us 15 min of misery to find an underground station and head back to the city ( windy, rainy, 6 degrees). It was definitely no fun, especially when we were rushing to visit other attractions! I did not sign up for a graffiti canal cruise but on a Danube river cruise. They should have made that clear! They should have also explained about cruise timings as well as differences between A,B,C cruises plus the need to exchange the tickets and where! I worked in tourism for many years and I find this company totally unprofessional! I asked for a refund and they played deaf/stupid on their chat page ( via app). If you want a hop on hop off , probably “Vienna sightseeing” is better. At least their stops are clearly marked ( unlike Big Bus) amd their drivers are willing to pick you up if they see you waiting

Waste of time and money! - The worst tour I ever had with Viator.com. The tour guide could hardly be heard over the channel (using ear pod). His side comments are uncalled for like, “IKEA company is invading Vienna”, who cares about it. You are there to promote your place, so talk about the beauty of Vienna!