I stayed at Casa Grumari for a month. A perfect escape. The house is cosy and tucked away in a national park. I've was lucky enough to see hummingbirds, hawks, parrots, and marmosets monkeys while relaxing on the hammock on the balcony that overlooks the forest. I also came across tree frogs, lizards and many different kinds of beetles on the property.
The house has everything you need for a long term stay except a laundry machine but it is very easy to hand wash with the water spigot outside. Hannah, the host, had excellent communication and checked in time to time to make sure my stay was going well.
The location is nice - just a short drive to the entrance of the trails to Pedra do Telegrafo and the untouched beaches in the park.