Fleming's was a pleasant experience upon returning to Wien. The reception staff was very hospitable and helpful, and provided a nice welcome. The comfort room was located a bit far away in a separate part of the building, but was quite spacious, very quiet and had all necessary amenities including a coffee maker.
The breakfast is ok, and the hotel has a sauna I intended to try, but did not manage to. Around the hotel some could find the area a bit dingy, but offers convenience stores, some restaurants and ample transportation.
I'd not hesitate to come back to Fleming's.