My stay at Joaquin's apartment, which is in a prime location right on Gran Via, was very pleasant. Hassle-free check-in, and the apartment was very spacious with lots of natural light in the living room and the galeria/conservatory room that overlooked an inner courtyard. With a work chair and desk and a dining table this room was perfect for eating and working. The rear of the flat lacks natural daylight meaning you need to have the lights on even in the middle of the day in the bedroom and bathroom, but this is very common in Barcelona flats, and may not be an issue for some.
I would have loved a kettle and an extra saucepan or 2, but that's just me - I cook a lot.
Overall, I had plenty of space, and lacked for very little.