We had a good time at Hernan's place. The location is perfect and the communication with Hernan was easy.
There are a few points worth mentioning that are not really covered in the reviews:
The apartment is actually two separate flats that open up into one. We were a group of eight so there wasn't really enough room for us in the communal area as there was only one couch.
Also the noise from the street is very loud. With the windows open to the balcony we couldn't hear each other talk because of the traffic.
Finally - the flat itself is a bit tired compared to the photos. It's perfectly fine, but is not as pristine as in the photos.