Absolutely lovely, clean one-room flat with ensuite and a little kitchen area and even a washing machine.
All you need for a few days in the city with close proximity to shops and public transport (no street noise though), easy to get to all sights/city centre with the nearby metro.
Susana was very sweet when I wrote her in advance and her father-in-law Roberto who did the check in with me was also most friendly and helpful. If I return to Madrid I will definitely book again. Gracias por todo!