My stay at Carolina's place was very nice. I had problems with my flight due to the pandemic cancellations and had to arrive after midnight, but it was no problem at all. The apartment has all amenities possible. It is not one of those places that are only rented out to guests. It is a real house with real people living in it. You have to expect to interact and mind other people's spaces. In my case it was very pleasant to have conversations and practice my Spanish. Connections to the center are very easy. There is a metro station not far away and I recommend crossing the river on the beautiful 18th-century Puente de Toledo if you walk to the center of Madrid.