I did not have a positive experience at Carlos' place.
The room was neat, but very small. The draw for me was use of the backyard, as depicted in the ad, however the host had a roommate and guests (not part of the ad/introduced), and having multiple unknown males in the backyard (a dinner party, then sunbathers) made me feel both unwelcome in my use of the backyard and uneasy as a solo traveller. (The host later told me that the female co-host listed doesn't live there.)
Also, room access from the carport was not lit, and I had to use my iPhone flashlight to see, which was unsafe on a few levels.
This may be a good place for one-nighters looking for a cheap hotel alternative before a cruise, but it's not suitable for longer stays.
The host should also change the ad to be clearer about around who's hosting, and about the possibility of his own guests using the backyard too: more transparency will lead to better guest experiences.