We met Javier just at our arrival. He is very kind and helpful. This little apartment is perfect for a short stay in Madrid, it's located in the heart of Madrid and so we could reach every place by food.
Aaaand if you want to eat good Paella, then go to "el escaldon gastronomia Canaria". The Paella tastes very delicious! In the most tourisic restauarnts the Paella looked muddy (slobbery).
WiFi in the apartment would be nice but not necessary. In the night The church clock is a bit loud, but if you're tired of all day walking then it won't annoy you =)
We would definitely book this apartment again =) Thanks Javier!