I had a great stay at Theresa's! Her place is only a few minutes away from a metro station and the metro is extremely easy to use in Vienna so it was not a problem getting to the center easily and quickly. There are also a good amount of places to eat around the place as well. Right next to the apartment is a cute little bakery I always went to for breakfast.
The actual apartment is very nice. The bed fits 2 people perfectly and is very comfortable. Everything was very clean and cozy.
Although Theresa wasn't present in the apartment the 3 nights we stayed, she was very responsive and communicative. She answered all my questions promptly and gave me very clear directions to her place, and anywhere I asked. She was a great host. Would definitely stay here again!