It has all to spend a relaxing afternoon. You can enjoy some exhibition, stop by the shop or chill at the terrace on the top floor. Terrace has a bar and it's full of plants. Good views. Quite ambience
Amazing view of the city from there. I went there only few minutes because it was very windy and cold. But it deserves a visit, absolutely. I'll come back in summer just to better enjoy the view of Madrid.