The apartment was well located, in the Malasaña neighbourhood, with nice restaurants and bars though not noisy.
We went as a group of 4, the apartment was small but had everything we needed, the sofa bed wasn't so comfy. When the sofa bed was out, the ladder leading up to the bed was difficult to climb and there was little space to move around, therefore I do not recommend going as a 4. The bed level was very low (approx. 60 cm), the front door lock was very stiff and the fridge makes a very loud sound.
The apartment would be perfect for 2, the kitchen and bathroom were both clean and the owner communicated well.
I would be 100% likely to recommend to a couple, but 50% likely to recommend to a group of 4.