I stayed here at the end of longer trip throughout southern Poland, and it was very pleasant. The hotel staff were extremely accommodating in terms of storing luggage, assisting with tour arrangements, etc. They also arranged for a taxi to the airport for me at an ungodly hour - 3:15am! On a very quiet street a block or two off the main square in Old Town, with a very nice restaurant directly next door. My only complaint was trying to get to bed early (9pm) was a challenge - there's a music conservatory right next door and rehearsals went on later into the evening. If noise is an issue for you, try to request a room in the front of the hotel rather than the back.
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