I stayed in Santiago's flat for two months. It has a great layout very close to the tube and very comfortable. Unfortunately there was no key to fully open the back doors to the garden which I suspect has to do with prior sticking issues with the door. There is another entrance, however. The thermostat was not in working order so I had manually turn the heat on and off resulting in very hot or too cool temperatures. The bathroom sink faucet leaked and I often awoke to a small puddle of water on the bathroom floor. Santiago is aware of all of this so I'm sure he'll have these issues resolved. There are also some simple cosmetic issues in the kitchen that could easily be sorted.
All in all it was a very good stay. Santiago was extremely helpful and a good host. After my stay he went above and beyond in helping me to retrieve some mail that had been sent to the flat after my departure. Thank you Santiago!!!