Overall this is quite a nice apartment (nice and bright living room, but tiny bedrooms) in prime location, close to major sights, public transport, shops and restaurants. There is no question about it, but there are several issues with this place.
We picked this apartment since it came with "free parking on premises". THERE IS NO FREE PARKING. Parking on the street is paid during the day (Mon-Fri, 9am-5pm) and parking in the property courtyard is ILLEGAL. Marta told me it is OK to park there and said she will provide a permit. Permit never materialized and we almost got fined (we speak Polish so I talked myself out of this, but good luck to those who do not, and Marta never answered her phone when I tried to contact her). I was told by the municipal police officer that there is no way she can issue a permit since there are no general permits issued by the council. In short, you get fined for driving into the courtyard (even to unpack bags from the car) and for parking there (2 separate fines). Be aware, they patrol there quite often.
Kitchen is sparsely equipped, there is no coffee machine (even a plunger would do), no cooking utensils of any kind. Funny thing - plates are too big to fit into the dishwasher.
No hand towels are provided in the bathroom and there are no hooks to hang towels in the bathroom although plenty of room on the walls to install some hooks. Becomes a bit of a nuisance for 5 people with towels all over the place. We had toilet paper, but no soap of any kind, some liquid soap would be good.
THE SHOWER DRAIN IS BLOCKED. It looks like it's been going for a while, but nothing is done about it. There was 5 of us (family) and each day we had to prevent flooding since water was getting out of the bathroom into the corridor. Very annoying and not something you want to do during holidays.
Several lights are missing light bulbs or are not even connected (free standing lights in the main living room are purely decorative).
Prime location - yes, but maintenance of the apartment is very poor from the host side.