Close enough to Lavapiés metro station, good sized apartment (aside from the kitchen which was slightly too small for me), and very well equipped. One of the comfiest beds I've tried, good A/C, top notch Wi-Fi, luxurious bathroom and excellent staff.
The neighbourhood isn't exactly the best, you see some closed shops and lots of graffiti, but people there are friendly and streets are (with one or two exceptions) clean. The hospitality we received from Carlos and his team more than makes up to it. They were genuinely concerned with our well being and always asked if everything was OK when we'd pass them in the building.
One negative point is that the walls are thin enough to hear other people talking in adjacent apartments which takes away some privacy, but we had no issues with noisy neighbours.
We were happy with our decision and we think it is a solid choice!