Blue Fin Cabanas is a lovely little peaceful retreat on Caye Caulker. My family and I stayed in the cabin for 10 nights and we loved it. It's small but really nicely set out, three of us had a comfortable nights sleep each night. The Air con is effective, fans help keep air moving and mosquito detergents meant we had no issues sleeping.
It's a little away from the main streets, but there's a really nice cafe at the end of the street, there's bikes to get back into town on if you need too. Even without its just a ten minute walk.
Being picked up from the ferry by Gustavo was a lovely touch, made getting our bags there very easy. Craig helped us organise restaurant bookings too.
I'd have no problem recommending Blue Fin to anyone wanting to stay on Caye Caulker, it looks great in the pictures and matches up to that in person too.
Indoors/outdoors bathroom is very cool, a shame we can't copy it, I doubt it would work as well back home in Scotland!