We had a great time in this apartment. It is really lovely, everything is well thought, with great decoration touches. Everything was really clear, we had a lot of information and could ask all the question we wanted.
I was traveling with my mom, so I was sleeping on the couch which is very comfortable. The living room has its own door and the bathroom is in the hallway, so when I closed the door, it felt like I had my own bedroom. It can be a bit noisy (cars noise), so if you're really sensitive about it, you might want to bring ear-plugs. It didn't really bother us, we were pretty tired at the end of the day !
There are a lot of food possibility next door. 3 Billa (supermarket) well furnished on the streets around, the Naschmarkt, so you can cook at home. There are also a lot of nice food place/restaurant around, we didn't test them but they all seemed really good.
It's really well located, it took us around 12/15mn to go to the Opera House (more 20mn at the end of the day, we were pretty tired with all the visiting we made !), but once again I was with my mom who can't walk really fast, so it could be faster for you ! It's really convenient for all the visiting in the center and the ring (and for eating cakes !! Don't miss them !!), and the Neubau quarter as well.
We really had a great time in Vienna, and staying in this apartment really contribute to this good time. If I ever come back to Vienna (let's hope so !), I will come back without a doubt in this apartment. Thank you so much Eva & Michi for this great quality of service, you made our stay really pleasant and easy.