This apartment is all about LOCATION LOCATION LOCATION. It is situated at the center of Gran Via so you are basically at the heart of Madrid. There are plenty of shops and restaurants around, and the tourist attractions are easily walkable. The Prado is around 10-15 mins away, Puerta Del Sol is 5 mins away and Plaza Mayor is around 10 mins away by walking.
The apartment itself was well-maintained and clean although a bit too cramped for a group of 10. There was enough bedspace for 10 people in the 3 rooms but if you factor in the luggages, it will take up space in the small living area/dining/kitchen. It would be more adequate for around 6-8 people only.
There was also a problem with the heating in one of the bathrooms as the hot water sometimes disappears while mid-shower which is inconvenient especially during the winter.
The frontdoor also proved to be problematic as it was really difficult (almost impossible) to open from the outside and we had to ask for help from the doorman to open it for us one time.
The host Flavia was very friendly and accomodating, and responded to all our messages promptly.
So if you want to stay at the heart of Madrid but wouldn't mind the cramped living conditions and a few inconveniences then this apartment would be suitable.