Slow Suites Chueca location cannot be beat and the size and quality of the apartments are very nice.
Downsides were that it was almost unbearably loud and there was no host onsite to assist with little difficulties (check in, key cards, and a tv that didn’t work for instance). Also I thought it was odd that there were no blankets and when I asked via the app for some I was told no because they don’t give them out in summer months....even though it was 60s all weekend.