This apartment is very spacious and clean. It's also in a great location - easy to get around by metro and most of the sightseeing spots are within walking distance. There are also many supermarkets and restaurants only a few minutes away. The kitchen is fully equiped to make your meals at home and having 2 bathrooms is definitely a plus when you have 6 people in your group.
Eduardo and Raul are always fast to respond and very helpful with any questions we had. Checkin and checkout was very easy as well.
Would highly recommend this apartment for groups wanting to stay in central Madrid.