I stayed at Mercure Raphael Wien for 4 nights and had a very pleasant experience. The hotel has an excellent location – in a quiet neighborhood, yet very close to public transport, which makes it an ideal base for exploring Vienna. Shops and everyday conveniences are also nearby, which adds to the comfort of the stay.
The rooms were clean and tidy, though a small renovation would be welcome to freshen up the interiors. Despite this, everything was comfortable and well kept.
Overall, a very good choice for a short city break and I would recommend it especially for sightseeing-focused stays.