I had an overall nice stay here (4 nights). The company members I spoke with were friendly and quick to respond to questions I had. Check in was easy, although only allowed during a very short period of time.
Great location, Two minute walk to the metro. Tons of restaurants, bars, and close to main sites of Madrid. And it's quiet at night! I am a very light sleeper and I did not hear anything. The few neighbors I said hola to were friendly as well. Bed was comfortable as were the pillows!
The pictures are accurate. As it is the attic room, the ceilings are slanted as per pictures, however they were shorter than I expected, and I had to bend over quite a bit on the perimeter of the room to not hit my head, I am 5' 10".
The main thing I would change is the shower does not drain and floods the floors, but hopefully this will be fixed soon, and the hot water in the shower lasts about 3 minutes, so you have to be fast if you want warm water.
The kitchen area is small as per pictured, but the two burner stove works very well and is filled with basic cooking utensils (no cooking food supplies except for oil, I did buy salt and left it there). As mentioned, no elevator, so be prepared to walk up nearly 100 steps, this doesn't bother me, but those with suitcases may feel otherwise.
Fairly bright natural light during the day.
Nice value for the price, good for one person could do two people but it would be difficult for more as there is no couch or extra place to sleep.
I would stay here again on a return trip to Madrid.