Enormous (for 2 people) apartment in an elegant late 19th century block, with 12ft ceilings. Clearly used as a home by Chistoph, which means it is very well-equipped. Smart TV and excellent hifi ( although I haven't seen minidiscs for a while).
Walking distance to the Museum Quarter, close to the main food market, the U-bahn and bus routes, but on a quiet street. Two well known coffee houses (Cafe Sperle and the Royal) are nearby.
The second bedroom has a bed on a high platform, which may not suit everyone, but there are two toilets, so this place would represent excellent value for two couples.
Great base for exploring Vienna. Didn't meet Christophe, but all communications were clear and prompt. Highly recommended.