The apartment is as shown in the pictures. I would definitely say this apartment fits a couple rather than 4 people sating.
First of all the pros: an incredible location in the Malasaña neighborhood. Close to everything. With that said the sleeping area is very quiet and you will have a good night sleep without any of the street noise. The kitchen is fully equipped for a light meal. Check-in and communication with the operating company were very efficient and they were quick to respond and welcome me upon my arrival.
The cons: the hot water tank in the shower will only allow a quick shower for very few minutes per person. You will have to wait 20-30 minutes in between showers. Heating in the apartment doesn't spread evenly, and if you visit during colder days it takes a while to hit up the place.