This flat is located about 20 min from Sol by tube. There is a short walk to Plaza de Castilla tube station and it's also very close to Chamartin train station, merely a 4 min walk. It's quite comfortable, with everything that you may need for a short stay in Madrid. Decor was OK, with the kitchen being quite well equipped. Shower was great! Although I didn't meet Carlos in person, he was always quick to respond to my messages, which is very reassuring. The concierge downstairs was nice and helpful. All in all, I had a great stay.