We had a wonderful time at Casa Marbella. Location is great, right at the Tortuguero Lagoon. There is a private deck were you can sit back and relax. Host Daryl is very nice and helpful. We did the boat tour that he offers, with an electric silent motorboat, recommended! At departure he arranged the water taxi to Moín for us.
Breakfast is nice, with fresh fruits every day and either pancakes or toast and eggs.
Rooms are basic, light and clean, the only minus I can think of is that the beds are a bit hard. If you're willing to spend a bit more on the room: take the one upstairs with the waterside view.