We stayed at Tribu Malasaña for four nights and had a fantastic experience. The apartments are modern, clean, and well-designed, with everything you need for a comfortable stay. The staff was friendly and helpful, and the location is perfect, you have everything you need right outside the door, and Gran Vía is only a 10-minute walk away.
The only downside is that the soundproofing between the apartments and the hallway is quite poor. We were woken up several times during the nights. There were also some odd, slightly annoying noises in the apartment that never really stopped.
Apart from that, we were very happy with our stay and would gladly come back!