This is a beautiful apartment and well suited to various combinations of guests. We stayed with our friends; we have a five month old and our friends had a 20 month old. There was plenty of space for the two families to have their own room and bathroom, but we also easily fit in the living and dining room and kitchen. Perfect for catching up with them!
The neighborhood has a ton of restaurants, shopping, and bars. It's right in the middle of gay Madrid, and the nightlife is easily accessible. There is a small park next to the apt, but with no shade trees, it's not practical in the summer. Instead we did the 20 min walk to Retiro which was beautiful.
Overall this was a lovely place. I would happily come back. Especially for the hammock!!!