I found the studio to be as advertised; it's small, but well appointed and has a large bathroom. It has a private entrance, but shares walls with the house on one side and garage on the other. There's also a door (locked) that joins the studio to the garage. The garage was well used during my stay and was noisy at one point during the day— sounded like an air compressor or something. The noise wasn't a big issue as I was not there (for the most part) during the day and it was very quiet at night. Mariana provides beach gear (umbrella, chair, towels, etc.) which was great. I also appreciated the mini-fridge, which sits right outside on a small back patio.
I have to say I was disappointed not to receive a call or email with instructions or details before arriving. When I finally called Mariana the day before, she seemed busy, asked what time I'd arrive, and told me she'd be there. She also seemed busy the next day when I got there. She gave me a quick tour and told me she'd talk to me more later, which never happened. I asked for an iron, which we agreed she'd bring later, but never did. I didn't bring it up again because (with the humidity) my clothes pretty much ironed themselves in time for the wedding I was attending.
All in all, I was mostly happy with the room, and the location, but felt the hospitality could've been better.