We spent 4 days in Karla's place. This is a really nice appartment, where you can rest after few long days visiting the city. The flat is very well situated, just between two stations of metro line 1, in a quiet neighborhood, and a secure building. We didn't actually met Karla, but she is very flexible (for the keys in particular), which is quite important when you want to travel elsewhere in the country by plane or bus.