Apartment is pretty well refurbished and had alot of useful furnitures, the apartment sleeps 4 occupants comfortably.
Some major problems were though that they didn't have very good sun-blocking curtains. Now normally, in countries where the sun sets at around 8pm and then rises at 7am or so, that's probably okay, however, in Warsaw, Poland the sun basically sets at 9pm and then rises at around 4am. Add to that that the sky never gets truly dark and you get a really restless night because of a lack of sunblocking curtains. And let me tell you, it gets REALLY bright.
In addition to no curtains in the bedrooms, there are also no shower curtains, so the water basically gets everywhere when you shower.
The apartment is also in a pretty lively venue, so they pretty much had loud, bass heavy music playing till 2 or 3 am.
Basically, you'll want to bring a sleepmask and earplugs if you want to sleep well here. But otherwise, this apartment is quite good, it's right in the center of Warsaw's Old Town with lot of sights to see and food options to get.