Angel's friend met us and showed the apartment. Its great placing is the biggest advantage of this appartment to explore the city.
But very messy apartment made our rest not so pleasant as we hoped. It looked like nobody clean it about weeks (dust on the furniture, in the corners of rooms behind doors).
At night we had perfectly heard our neighbors speaking, taking a shower and even cooking. So the bedroom is close to their kitchen and bathroom and there is no soundproofing.
But at all the appartment is a good choice to stay in Madrid for a few days and have a rest after a day full of impressions