My stay at Casa do Mar was nothing short of wonderful. Larry is a great person who always made sure I had everything I needed. I stayed there for two months, so Casa do Mar really became my home. I found the peace I needed to write two dissertation chapters (despite some carnaval cameos), and really learned a lot about Vidigal.
About the place. Casa do Mar is located a few steps from the main road. The first time you get there you might feel there are too many steps, but trust me, you will get used to it the second day. You should be aware that Casa do Mar is located in a favela (Vidigal). That being said, I never felt safer in Rio than the moment I would get back to Vidigal. I would walk around with my headphones, texting, etc. The community is made up of wonderful hard-working people. Just make sure you are respectful to them, and they will reciprocate.
Will definitely come back for more White Russians with the Carioca Dude!