The apartment is in a fantastic location. Great bars and restaurants all along the street and the central tourist attractions, such as Plaza Mayor and the Royal Palace are only a short walk away, as are the main shopping areas, so it's really easy to explore.
The main living room is very spacious, but be sure to ask for bedding if you're hoping to use the sofa bed. The bathroom is small but the shower is nice and powerful. The kitchen work space is also compact but it had everything we needed.
Messages are answered really promptly, which is great but I didn't realise until the end of my stay that it wasn't the owner who was communicating with me, but a third party on her behalf. No complaints about their service but it was a bit confusing and would have been nicer to know beforehand.
But I'd definitely recommend it as a place to stay and hope to come back again one day soon!