The apartment of María is really nice and you have everything there what you need :)
Whenever we had a question we could always contact María and she answered immediately!
The Wi-Fi is super good! I was working from there and I had no problems at all. So if you want to do a trip with working and sight seeing, the Wi-Fi is top :)
Also walking to the Centro is no problem at all :)
I would definitely recommend the apartment of María! We had a wonderful stay there!:)