We really loved Carlos and Harrald's apartment! We didn't have the chance to meet them in person, but check in and communication were very easy . Both Carlos and Harrald were really helpful when it came to recommendations in the area and answered every question we had. I have visited Madrid many times but never stayed in Lavapiés area before and I can't recommend it enough, on the street where the apartment is you can find everything from mercados, galleries, cafes, restaurants and interesting shops, so lovely! I very much hope to visit again in the future.