If you need an inexpensive place to stay and plan on spending most of your time in the center of Madrid and not much time in the apartment, I think you will be happy here. The apartment is small but clean and overall the area is safe. The walls are very thin so you pretty much hear loud noises from outside or your neighbor across the way or upstairs, which is not ideal when trying to sleep. I wouldn't recommend this place if you plan on having a car rental as parking was a bit of a nightmare. The metro is very close by so easy to get to and from center of Madrid. Bring an eye mask for sleeping as the sun-blocking shades in the apartment don't block anything. There is a lot of dog poop all around the outside surroundings as there's just a lot of concrete and not much grass and a lot of people seem to own dogs in the area and not all pick up after their dogs so that was a bit gross. Marine is very nice and her place itself is clean and inexpensive. If you're on an extreme budget and plan on spending most of your time out and about, you should be fine but I think it's good to fully know what to expect.