We stayed at Daniela's place for 10 days and it worked out well for what we wanted. We love the vibrancy of Chueca's nightlife and restaurants and the space is right in the heart of it (sure, it gets loud even on the 4th floor; but that's part of the charm). There's a coffee shop right across the street.
Plus: A/C and water pressure were great. The apartment was perfect for my wife and I. Lots of closet space. Washer is also a big bonus. Elevator is a plus with suitcases.
Can Improve: The quality of the towels can be improved especially for a 10 day stay. Bathroom was musty; but very typical for European bathrooms in central locations.
Otherwise, we enjoyed our visit.