We booked the entire space for 12 people for the week of Carnival. The apartment is unique and spacious. The common areas are great for groups. We loved the hammock room and the giant dining table. Everyone had a comfortable bedroom. People could rest or party without being intrusive.
The building is older and the apartment is vintage, but it's what gives it such charm. Be aware that you won't have some modern amenities like keyless entry or central AC. Some items were tricky or faulty, but the hosts are very responsive and eager to help. We were worried about sharing only 2 showers with 12 people but it was actually never a problem. A cleaning woman comes every couple of days which is super helpful. The location is wonderful, right in Botafogo and walkable to all the restaurants and bars. You can explore the whole neighborhood on foot.