We had an amazing experience at Clara's apartment. The host, Clara, was extremely accessible and communicative, not to mention an extremely nice person. She helped us settle and get accommodated. The apartment is very roomy and there are no negative details worth noting whatsoever. The neighborhood Arguelles is one of the best in Madrid and an easy 7-10 mins metro or bus ride to the city center.
We'll definitely stay again if we're in need of a 3 bed / 2 bath apartment, and perhaps even if we're not. Thoroughly recommend.