I totally recommend Conchi's studio if you are planning a short stay in Madrid. The apartment is very conveniently located for exploring the city, nicely furnished with attention to details, comfortable and was impeccably clean. Extra points for the bath soap and the shampooing which had a great scent.
Conchi is a great host who is very easy to get in touch with.
I would definitely consider this flat again should I be in Madrid for another weekend escape.