We had a wonderful stay! The apartment is centrally located and walkable to all of the main historic sites, markets, plazas, parks and restaurants, and the train station and airport were a short drive. We were in the heart of Madrid, walked everywhere and never even needed a cab. It is central to everything, and you could pick a different direction to walk and find something to see, visit, shop or eat! We felt very safe in the building and in the apartment. It was mainly quiet day and night, as you are on the 4th floor, yet you could here sirens going by. The apartment seems to be newly remodeled, with all new appliances and was perfectly clean. It was the most efficient use of a small space we've seen! It was tight living quarters for 4 adults and 3 pieces of luggage for each couple, but we made it work. The beds were very comfortable and the large closets were helpful to store our luggage, clothing and toiletries. In the closets were 2 fans which helped with airflow at night for comfortable sleeping. We appreciated having 2 bathrooms, but beware, the showers are very narrow, without being able to bend down, and a large person would not fit. The balcony was incredible! It was spacious and the views were great, as you could even see into the arch of Plaza Mayor. The apartment has a modem decor and had everything we needed with a small fridge, cooktop stove as well as kitchenware. We definitely recommend this stay and would return in the future!