We stayed at Nader's flat for a long stay. The location is great. You are literally two steps away from Gran Via and Plaza Callao but off the busy path, in a relatively quiet street. The building is quite old, but the apartment is recent and comfortable. It is located on the third floor with two elevators to get there. The fact that it is at the back of the building makes it quiet. However this depends on who is staying next door. The walls are thin and we could hear what was going on next door just as if we were in the same apartment. At times when their front door opened we thought it was ours. Within very close walking distance you have two supermarkets DIA (Plza Santo Domingo) and Corte Ingles (Callao), Metro Callao and Santo Domingo, many restaurants including Starbucks. One of the best locations we have experienced in Madrid. One major problem we had was a constant sewer smell in the bathroom. There was no way of controlling it and it was very strong. All we could do is keep the bathroom door closed and bear down when using the bathroom. It appears it is a structural problem from the floor drain. Nader did offer to provide a spray to cover the smell. But the problem remained. We also had a problem with the iron and Nader was prompt at getting a new one to us. The pictures on Airbnb are accurate except for the curtains and rugs that no longer are in place. We enjoyed the TV with cable channels. Nader had sheets and towels available. We were able to do laundry, use the refrigerator and do some basic cooking. There is a dishwasher available. The bed is a double bed. Windows can be opened without any vis a vis. You just have a view of a wall, but plenty of light because the wall is about 10 meters away. Had we not had the sewer smell problem this apartment would be highly recommended.