Maria and Carlos have a lovely place! It's not large but good enough for 2 people. It's within 5 min and 7 min walk of two metro stations. We managed to lug our heavy 20kg suitcase from the metro with little difficulty. Although, do note that you'll have to carry your suitcases up four flights of stairs in a narrow area. Carlos was amazing and helped us when we reached but we had to carry it down when we checked out. Other than that, I had an awesome stay. The bed was comfortable, hot water was readily available and everything we needed was provided, including a kettle and hairdryer. I would stay there again if I ever go back to Madrid!