What a lovely apartment & welcoming hosts! I felt very comfortable, with O & V ready to advise on routes / sights & provide information about the city but equally happy to let me do my own thing. The location is perfect, particularly if you're a big fan of museums like myself, with many within easy walking distance.
The room is large, the fouton comfortable and all the essentials provided for. The only downside was the building work taking place nearby was quite noisy but otherwise I really enjoyed my stay and hope to return (and stay with O & V) to explore Vienna further in the future.