I spent a month here by myself in May/June. Carolina and her husband were always super helpful and communicative any time I needed anything.
The house is on a big, sometimes-busy avenue in a calm neighborhood. A block away from the house is Avenida Elcano which is really nice and has a lot of good markets, places to eat, and stores. There are bus stops and public bikes for rental within a block radius or so. Also, as Carolina recommended when I checked in, and as other friends of mine corroborated, you have to try the pizza (especially the fugazzetta rellena) from La Mezzetta, which is a classic pizzeria less than a block away from the house.
The place itself is well-outfitted and very spacious with high ceilings and nice floors. It is a classy older house with some character, which I preferred over the generic apartments that you mostly find for temporary rental. The kitchen and living room are nice; a couple of times I had friends over for dinner and movies and it was a nice comfortable environment. The showers are good. The beds are very comfy and the back bedroom is nice and quiet with a good heater.
I do have to mention that if you work on your computer, there isn't really a perfect place to do so. I made it work, though, by putting a couch cushion on the floor and sitting at the coffee table. It wasn't bad at all but wasn't exactly ideal. Anyway, that was my personal oversight, not a problem with the place itself.
All around staying here was a great, relaxed experience. I enjoyed it and whenever I'd have friends over they were impressed with the place. I'll definitely be considering coming back to stay here in the future. Recommendable.