Strongly recommend! There is no doubt that there are more than enough things to do in Vienna in the city. However, if you want to escape the city for a day (most of a day!) this is a great way to do it. Basically the trip has 3 parts - the monastery, a church, and the underground lake. I'm not religious, and was in awe at the monastery - the stained glass windows left me speechless. The underground lake is an amazing sight. Be warned it is naturally a constant temperature of 9 degree celsius, which was actually a nice way to escape the summer heat! After a guided tour through the abandoned mine, you have a boat ride which was incredibly peaceful. This is where part of the 3 Musketeers movie (with Kiefer Sutherland) was filmed.

This tour may be a bit different in winter when it gets darker earlier. I enjoyed the tour, but felt parts were overstated on Viator. The "admiring the historic buildings along Ring Avenue" was just a coach trip around the ring. Views from Danube tour were great, but still light due to it being summer. The description says 'end the night at a wine tavern in Grinzing", but most of our time was spent here, and if you are a non-drinker (like I am), it wouldn't be on your list of things to do. Having said that, the tour guide was very friendly and knowledgeable, and the performers at the winery were very talented.

A fairly short tour, but this is clearly advertised and is very inexpensive. You are on a coach for almost the entire time, we had a quick stop at the "church in the rock" and also at the Seibelus monument, but apart from that you stay on board. I would have liked more of an opportunity to get off the coach and a bit longer at the church. However, it certainly gave you a good feel for where things were in the city. Excellent tour guide as always.