We stayed in Rosario's place for a few days while seeing Santiago. It is not fancy but generally comfortable. The bed is loud - like if you shift it squeaks. Maybe a few minutes and a screwdriver could solve that.
Something that is beyond Rosario's control is the street noise. We were 14 storeys above ground but it was still very loud, particularly a balcony dog in the building across the street. I mention this because some people are very comfortable with City sound and some are not. This is a City.
I don't know that we'd stay again but anything that we might say didn't work great for us is beyond the control of the host. They were super helpful in checking in and providing a luggage hold for us on check-out.