Antonio's place is GREAT! It's super clean and tidy, very cosy and nice. Antonio provides you with everything you need (even breakfast!). He is an amazing an welcoming person, and has very good recommendations for things to do in Madrid.
The location is perfect - close to the park, close to the metro, close to the center.
All in all, my stay was great, and price-quality ratio is definitely among the best deals you can ever get! Totally recommended!