Our family (myself, my wife and our toddler girl) initially planned to stay at Silivia's place for a month. But we eventually ended up spending 3 months there because of travel restrictions through March-May 2020.
Overall, our family had a positive experience. We especially liked the location of the apartment situated very close to the El Corte Ingles huge supermarket, shopping street, nice parks (just 15 minute nice walk) and the city center (about 25 minutes walk).
Silvia has been very quick in responding to us whenever needed. We needed few minor issues to be fixed in the apartment, and she arranged that in just few days.
One of the main disadvantages for us, was the lack of direct sunlight in the apartment, especially in the bedroom. The place is bright, no doubts. There is just no direct sunlight needed in colder weathers. Though, this might be a big bonus in summer time, when it is very hot in the city.