The apartment of Elaine is really good located. In the midle of Barrio Alto. We spent two nights there and our experience was good. Elaine is a sweet and sympatique woman who was attentive with us during our stay. The only negative thing we should say is that the street is really noisy at night, so bring with you some earplugs if you want to sleep before 3,00.
We would repeat there :)