I had a fantastic one month stay at Marcia and Luiz's place. Exceptional hospitality, starting from arranging an Uber pick up from the airport to sharing meals with the family to help in getting to my next stop.
The bathroom and kitchen are shared and I always found these spaces to be clean and available for use. The family also has a friendly bunch of dogs but they do not enter the guest's bedroom (unless maybe you want them to!).
The location of the house is very good. It has the advantage of being inside Botafogo while still being able to watch it from afar. It took me just about 12 mins to walk to FGV, 15-20 mins to the nearest metro station and 7 mins to the supermarket. I usually took the shortcut walking route (note - there are several steps on the shortcut) to get to these places and used Ubers at night, which were easily available and reasonably priced.
I would recommend the place to anyone looking for a safe, clean, reasonable and friendly spot in Rio.