We just returned from a 3 weeks stay at Juan's place. Since we stayed there so long there is so much I could say! We traveled with a baby and a toddler and I picked Juan's place because it was plain and clean of clutter. Kids just cannot handle clutter and Juan's apartment is ideal for that.
Juan provided a crib for our baby and we all slept in one room and used the second room for our clothes and luggages.
The location: You are super centrally located. You can walk to at least 3 nice grocery stores. It is also nice and quiet! Which is rare for Spain ( we drove around the country too).
The best part of picking this apartment is the host. Juan is a wonderful host, he does things that he really does not have to. He literally left work to help us resolve problems with the mail delivery, he research answers to our questions, and he did EVERYTHING to make our trip as easy as possible. We could not thank him enough.