I visited Madrid just for 5 days and was staying in Sergio's apartment. I came with my mom and our dog.
First of all wanna tell about location of this apartment. It's really cool! House is situated at the square with many pretty cafes where you can have lunch or just a cup of coffee. If you are traveling with children there are a lot of playgrounds and there were always lots of children playing soccer at the square. The metro station is very close to this house, just 2 minutes walk and this station is the same line with central station "Sol" (about 7 minutes).
Apartment is very clean and modern-styled. I like this style so I felt comfortable.
Sergio is very polite and hospitable. He met us in the morning and helped with our luggage. Then he provided a short excursion of his apartment. The day before leaving I asked him to call for a taxi and he kindly agreed to help us.
So I was very happy to rent Sergio's apartment!
Sergio, thanks a lot for you!