This is a great, stylish apartment with great amenities, very responsive and communicative hosts, and well-located to reach the Guggenheim, Old Town etc on foot, as well as a number of very handy supermarkets very nearby.
To echo the reviews of many other visitors, I would say that if you are a light sleeper, or if you are here for work, this place is not for you. It is above a kebab shop which is very noisy (and unfortunately quite smelly) until about 1/1.30am every night. The road itself is also quite noisy, with loud traffic throughout the night and noise coming late from the casino over the road. In short, bring ear plugs or consider a different option if you value a good night's sleep!