Eduardo is a great host with a great flat.
I was in Madrid in late March, and the place was warm and very comfortable.
Eduardo was very quick to respond to texts, and unfailingly polite throughout.
The shared kitchen and showers / restrooms are clean, well maintained, have good water pressure and plenty of hot water.
The bed was clean and comfortable, the room had plenty of outlets for charging batteries, a lock on the door, and a heater was in the room if needed.
La Latina, the neighborhood in which the listing is located, is hip, with great food, drinking, and music options.
It is also easy walking to most of what you want to see.
If walking is not your thing, the Metro is a three minute walk.
Aces all around.