Location location location! It really is amazing. Vienna is big enough that you'll likely want to hop on and off the subway if you don't want to wear your legs out (save that energy for the sites!), and this apartment is just steps from a subway entrance. It's also steps from a coffee shop that is open early and stays open late - so if you need a morning latte, or a latenight ice cream they've got you covered.
After a long day seeing all the sights, it was so nice to hop on a train, and when you got off -you're right there. But you really don't need the subway for many many things - you can easily walk to dinner or the Museum Quarter etc.

Caroline is fluent in English and German so she was very helpful in getting us settled and introducing us to the neighborhood. It was pouring rain when we arrived, but when we asked where to buy a converter for our electronics, she insisted on taking us to the place and buying one for the apartment to stay (and she bought one for us! lucky us - I'm sure that was a one time thing though :) ).

Like many places we visited in Europe, there is no air conditioning, so you will want the windows open. And there is some lovely street noise - makes you feel like you're right in the middle of everything. Unlike the middle of Chicago or NYC though, it calms down at some point (10? 11? 12? i don't remember). To us, it was part of the joy of being there - being in the midst of it all. There are two different grocery stores close by (which we took advantage of!).

The apartment is primarily one big bedroom (like your hotel room would be except much bigger), with comfortable arm chairs to sit in, a separate small kitchen and separate bathroom. When we were researching where next to explore in Vienna, it was lovely to sit by those big open windows and look out. Good reading lamps by the bed.
The wifi worked well while we were there. And there is a lift so you don't have to trudge up the stairs after a long day sightseeing.

The kitchen has all the basics, including a hot water kettle, and a little espresso maker. Caroline left us tons of different kinds of espresso pods and tea bags. In the fridge was creamer, some nice jam and things. (we consumed plenty - but we did try to leave a few things behind! :) ) After traveling and eating out for so many days, it was great to be able to make a few meals 'at home'.

And Caroline, we did leave behind a small bottle of champagne in the fridge! I hope someone enjoys it! Lovely stay in Vienna.