Had a great time in Madrid and would stay here again.
The apartment is very clean, with air conditioning, plenty of bathrooms, and comfortable beds. The location is very convenient to several metro stations with good connections to many sites. For those that like to walk, many sites are reachable. There is good shopping close by, both for food and for other goods.
The neighborhood is very young, so there is activity on the streets until very late. This apartment faces away from the streets, so noise wasn't a problem.