I would highly recommend Ramon's apartment if you're interested in exploring Madrid. It is very clean and comfortable, and the A/C is very effective, which is a must if you're visiting in the hot summer months. Marco (the gentlemen for who was responsible for our check-in) was very friendly and helped us book our taxi for the airport. The check-in/check-out process was very smooth and there was an elevator in the building, so taking up luggage was not an issue. The location of the apartment is also unbeatable, as it is directly in the heart of the city-- the building actually backs onto Plaza Mayor, which was great! There are many shops, restaurants, and museums within walking distance and the metro station is right down the street.