I couldn't recommend Joe and Dolores's place more as a destination if it's tranquillity you're after. The lake itself has a beach and is good for a swim (if you like your cold water swimming), there are lovely walks in the surrounding mountains with spectacular views and there's a choice of short drives to other breath-taking places in Connemara.
Dolores and Joe are lovely hosts. Communication was great, without being intrusive in any way. We'll be back this way for sure.