Communication with Axios Sun before my arrival was excellent, he was prompt and returned every message. Basilio was available to pick me up at the water taxi after a quick walk to request the service. I paid him for the service because I valued his time, but not because he asked. Rosie and Basilio (Hosts) are wonderful people and great hosts. Unfortunately, I was never able to get more than "lukewarm" showers. I think the apartment is a great value for a group. As a solo traveler, it was still a decent value. It was very clean and the kitchen sink was polished. The coffee/sugar/creamer were nice. The location was wonderfully close to the Split and everything in town. I found it to be a bit noisy (I had to sleep with earplugs due to people and dogs) but everyone I met on the early morning dive boat had the same complaint. I think there are two ends of the Caye Caulker continuum - those who sleep late and party long and those who wake early and dive long. :)
Of note: it seems the owners allow camping on the grounds/yard. Admittedly, this detracted from my overall experience as it felt a bit transient. That said, I appreciated the apartment and had a good experience.
Wi-Fi worked pretty well - as good as could be expected for the island.