Apartment is beautifully designed and location is great for exploring Prague. Also neighbours seemed quit or at least we did not hear them.
Unfortunately there are many small practical issues that might annoy you if you stay for more than one night and try to actually use some of the features - cook, wash clothing or just spend more time in the apartment. Missing hairdryer, clogged sink, broken electric tea pot, no hanger for washed clothing and no washing powder - these were few of the things that we experienced during our 3 day stay. Also non-smokers probably will notice that bed linen and towels smell of cigarette smoke (although they seemed clean).
So in short - great place if you are a bachelor staying for one night and you do not plan to cook, use the washing machine and hang out there. Not great if you plan to stay for a few days, cook, wash clothes and relax.