Had a great time in Wien and staying at your place!
The only suggestion I could make is the initial check-in to the apt was confusing and little hairy. I wasn't using the app on the phone to get in. It sounded 'optional' in our communications. Luckily my friend who lives in Vienna picked me up and was able to reach someone who was able to remotely unlock the place. Otherwise it would have been very frustrating because I just got off a 9 hour flight, very jet lagged, tried and kind of lost, and my phones data wasn't working in Vienna yet etc..
Other than that it was a great time and a great place :) Thanks!
--joe