We stayed with Isaias for six days during carnival. He was a good host and took us to blocos around the beach of Leblon and also showed us the beach and some nice places around. The apartment itself was not very clean at our arrival, also it is not suitable for three persons really. It is one single bed, plus a sleeping bag which is only fine for a few nights, but nothing really comfortable, also the couch is quite uncomfortable to sleep on. Maybe Isias will fix this in the future.
The location is quite good, close to the beach where you can surf and have a lot of fun. The neighborhood is not touristic.