Peter's and Katharina's apartment was perfect for us! It has an incredible location! You are in 2 minutes on the metro and train station (Westbahnhof). The apartment was very clear and warm enough! (We had a quiet cold weekend outside in the city). The kitchen is not empty, it gives possibility to cook or have a nice coffee! The beds were very comfortable (also the sofa bed!).
The hosts are very flexible and friendly!
I can just recommend them!
I think if we visit Vienna again, I will rent it again!