We stayed in apartment 4001. The photos don't really do the apartment justice. It is beautifully furnished and has everything that might be needed for a short stay. The separate lounge was great for us as my wife had to work at times. The location couldn't be better for the old city. The Blue Mosque is almost literally around the corner. Despite this proximity to the centre of things, the apartment is very quiet and even the sounds of the call to prayer seem to be muffled.
Drawbacks: Very few. (1) Our apartment was on the 3rd floor with quite a narrow staircase to negotiate. Help is available for carrying suitcases, etc. (2) Limited storage space and more soft furnishings e.g. pillows, cushions than anyone will ever need. (3) Bed is 180cm*180cm. I'm 191cm but bed size didn't affect either me or my wife greatly.