We were a group of 4 staying at Islandia - me and my partner in one room at the front of the house and his parents in the other room next door. Kirk met us on arrival and could not have been friendlier or more helpful giving us a full tour of the house and tips for our stay.
Beautiful views from the deck and the room we had did indeed feel like a treehouse - it was so wonderful to wake up in. The brand new composting toilet was so great that me and my partner never actually ventured into the main part of the house to use the proper bathroom. The 'kitchenette' is a little tight but adequate for washing your hands after the bathroom and filling up water bottles, etc.
Definitely the highlight of our stay was our evening in the hot tub looking out over the sound at sunset and watching seals playing in the water.
There was a slight hitch in that Jon felt I had underpaid and although by my records this was only by $3 we were asked to leave an additional $30 cash when we left (luckily one of the group had just enough on them as I only had a small amount of change and it would have been very annoying to have to drive into town and look for an ATM when we were trying to get on with our day).
Despite this we had a very pleasant stay and would definitely return. We've already recommended the place to two other friends who are going to Salt Spring.