We booked a studio apartment. Good points: fantastic location, good airport link (197 bus very near) museums nearby, quiet street, nice buildings. Apartment has everything you need and supermarket nearby. Shower is brilliant. Apartment cleaned and tidied every day - even the breakfast dishes left in the sink because the dishwasher was full. Check in was smooth, just pick up the envelope in the hall. Bed was lovely, the mattress and pillows were so comfy - I have trouble sleeping normally but was out for the count the first night. The two single quilts on the double bed were great.
Not so good points; the apartment we booked was dark - the other studio has doors opening on to a courtyard, (the studios are in the basement) The very nice electrician who co-incidentally visited to check out the lighting in our apartment said they had plans to improve it, but you need to be aware it is downstairs with smallish high windows where you see the legs of passersby! We felt a bit disappointed that we hadn't got the other one! When you book an apartment you like to come back after sightseeing and relax in a nice atmosphere whilst making something to eat and drink. On a sunny day it feels gloomy. I would consider upgrading to the slightly more expensive apartment if the back studio was unavailable. Don't forget to buy kitchen roll - they have towels in the kitchen area but nothing to wipe up spills etc. Also check the salt cellar has salt in it! We didn't and it spoilt our dinner a bit. The stairs down to the apartments are very steep and not the safest so not ideal for very young or old. The apartment is generally clean apart from the top of the shower rail and the extractor fan (although high up things tend to get neglected in almost every place I've visited)
All in all I would have no hesitation in recommending Nova Apartments, and with a little attention, my little niggles will not affect future travellers.