Sensory overload.
The unit is attatched to the main house and can hear everything from the main part of the house. The first night, they had people over who played music and talked and laughed right outside the unit. My earplugs couldn't block all of it. After messaging the host, they did quiet down around 2am, but I shouldn't have had to ask. I really needed sleep and almost went to sleep in my car. The stress if it all kept me awake for a while as well. I probably only got 1.5-2 hrs of sleep that night in total broken up through the night, which made for a rough following day for an already stressful trip due to the nature of my visit.
In addition to the people noises, there are plenty of other sensory things. A green light flashes from something on the bedroom ceiling every 30s or so, which also kept me awake. A light in the bathroom plays a tune every time it turns on. The light over the shower randomly flashes with strobe-like effects. There are chimes outside the bedroom window, which possibly would have been fine had I not already been on sensory overload from everything else, but they just added to the chaos.
I would advise against this place for anyone who might be an HSP, autistic, or have SPD due to all the sensory stuff.
The patio where everyone hangs out is right outside the bathroom window, which has a curtain that doesn't fully cover the top of the window. The bottom of the window has distorted glass but wasn't covered. It didn't feel private.
Good things: The towels were plush, and the couch has a nice, soft fabric. There's a nice view when sitting on the couch that looks out on the backyard. The hosts are communicative and willing to help if anything comes up, but there wasn't much they could do for me during my stay, except keep the volume down my second night so I could get some sleep.