Great location to be able to access the busy bits of Vienna without being in the midst of it. You can be at Stephanplatz in a 20 minute walk or 10 minutes by trains and trams nearby. Some great local restaurants and wine bars to visit also that are not full of tourists (except us!). Pia was very helpful with checking in as we wanted to drop some bags early.
As mentioned, it is via lift to 3rd floor then stairs and the lift is tiny - one person plus luggage. Also, we were there during 30C+ weather and it was quite warm in the flat with no air con. The set up/provisions are adequate but not luxurious.