My partner and I stayed 2 nights at Marc's place and we can highly recommend a stay there! Marc is a really nice and open-minded guy, he gave us some info's for what to do in Kona, we had nice talks with him and he cutted down a fresh coconut from his tree - really nice experience :) ...
The room has an own entrance and you will have your own bathroom - so privacy is given. You can borrow stuff for snorkeling from Marc and everything like the beach, bars, etc. are not even 10 minutes walk away!
If we will ever come back, we would book a stay at Marc's place again!