We stayed at the Hotel Unicus 15th to 18th February. The hotel is exceptional with helpful and friendly staff who responded to emails prior to our arrival (and even sent a car to pick us up from the airport) and gave us useful information on Krakow and arranged transport for us to Aushwitz and back to the airport.
The rooms are large and have fantastic bathrooms - underfloor heating was very welcome as it was very cold and snowy when we were there. Cleaned every day and given we were on the front of the building (which is close to the main drag) there was little noise in the room and the black-out curtains were brilliant.
Food was top notch and reasonably priced. Breakfast was a huge selection of cold and warm food plus menu to order (i.e. omelettes, smoothies etc) if required. We ate in the restaurant on the first night and it was really good quality. Only negative (but minor) was the lack of atmosphere as it was quiet.
Facilities - didn't have the time to use the sauna so cannot comment.
Would recommend to anyone staying in Krakow as you are very central but not right on top of the square - a two minute stroll away.
Overall a Top Hotel and we would return.More