We stayed at Rafael's house for 7 nights.
The apartment is located about 20 min metro ride from Plaza del sol (old town/centre) and the cost is about 1.60 euros each way.
The neighbourhood is safe and quiet area with quite a few supermarkets close by but not a lot of restaurants. There is a small cafe at a close by plaza for coffee.
The wifi at the house is great- very fast.
The kitchen has everything you need to make a meal.
The bathroom however has a bit of a plumbing issue due to the building being really old 1950's (if i remember correctly). The tub does not drain properly which makes for a difficult and unpleasant shower but nothing Rafael can do anything about. The flush part of the toilet broke when we were there and Rafael was kind enough to get a plumber right away to fix.
The room itself is perfect- spacious and a window that can be opened.
Rafael and Isabella are the nicest hosts we have ever met. Rafael took us around the neighbourhood to show us the grocery store etc. One night we even had wine and tapas with them. They're very welcoming and friendly. Rafael and Isabella do not live in the unit you will be staying in, they live in the next unit. They just use the living room of this unit for tv/computer. This gave us a lot of privacy since we expected they would live in the same unit.
Conclusion- we definitely felt like it was worth our money except for the tub draining issue (hence the 4 stars and not 5)