hi Qwerty,
I cannot comment on the quality, but I can comment on the location.
The further out you get from Nowy Swiat, Plac Trzech Krzyzy, Stary Miasto etc the more the price drops.
local people are selling flats in old concrete blocks on the edge of the centre for over 10,000 PLN a metre. Don't buy one as they are riddled with cockroaches, the block will be falling in around your ears and you might have the neighbours from hell.
Prices on Nowy Swiat can cost 35,000 PLN per metre in new luxury developments.