We enjoyed our stay. The environment is really nice, and the grounds are well maintained. Tranquility is basically a one-bedroom, two bath duplex with a Murphy bed in the common area. It worked perfectly for a family of four (willing to share a bed). The air conditioning was questionable, but it was OK.
Like others, the lack of service is their glaring issue. We asked for fresh towels and had to ask 3 times. Advice: just ask for daily housekeeping. They’re not coming if you don’t. There are really few “resort” amenities ultimately. The kayaks were “in the shop”, but there were paddle boards available.
The pool is really nice. The “beachfront” was lovely, but there’s a lot of concrete, not a natural shoreline, which may be common on that side of the key.