First:
The address is shown on Expedia as a main address is only for the keys pick up. You have to look for the real address of the place you going to stay in the brackets of the apartment that you choosing. The real place could be so much further from the city center that you expected. You’ll get notification about it 2 day before arrival to Warsaw, and be very surprised.
Unacceptable
Second:
Building is old. Lobby is renovated, you have elevator, and corridors are ugly. Apartment is descent size. Washroom is tiny, and you have to seat on toilet sideways, because there is no room for your leg and shoulder, kitchen under cabinet lights are not working, water is leaking from the kitchen faucet.
It’s OK to stay for a few days