Stayed 3 nites there during a WE.
Conviniently located. Check in / Check out were ok.
Room was great: Clean, very large, modern design, complimentary water every day. Good bedding with a true king size duvet (and not these 2 pieces - impossible to tuck in - you can find in many hotels in the eastern/nordics countries for which you spend most of the night with your foot outside!). Separate large WC. Bathroom a bit small but very nice and large shower. Complimentary WiFi with good bandwidth (was even better than the wired connection). Very good ratio quality/price. Buffet breakfast was included and was ok - I knew some that were better, but you could manage to find your happiness :-).
So to summarize an excellent stay. I can recommand without hesitation.

This is a modern business hotel about 15 minutes walk from the central train station. It's a large property so service was not as personal as a b&b, but on par with a hotel of this size. It's well decorated and nicely maintained. Didn't stay long but our impression was good, especially for the price.

Staff friendly, professional staff, comfortable environment to relax after sightseeing or business meetings, the room in spite of an extra bed for children big and comfortable, excellent usytuaownie, ease of travel, in weekand no problem with parking your car

Price – 173 PLN a night; double (special offer)
Cleanliness - excellent.
Quietness - excellent.
Comfort - excellent.
Location - excellent; sort of a centre of gravity for all the sights.
Friendliness - excellent.
Classiness - excellent.
Room included – sitting area, flatscreen tv; fridge; coffee making; shower.
Facilities included – fitness room.
Stayed at three Mercure hotels in Poland – splendidly consistent in their excellence.