Lucia was very attentive and eager to help in any way she could. The flat is small and compact, but practically laid out and has all the necessary amenities. The air-conditioner does its best, but cannot keep up with summer in Rio, so it never gets as cool as I like it in the flat (stayed around 25–27C most of the time).
The Internet was—for once—completely usable and reliable (if not exactly impressively fast: playing video content would buffer a bit, but generally worked decently).
The location is fantastic: about 30 m from the nearest Pão de Açúcar (supermarket), 100–200 m to the beach, about 100 m to the bus stop where you can get the main Copacabana bus lines, including to the main bus station—and there’s a pharmacy literally right next door if you should need it.
All in all, would recommend, but perhaps most for times when the temperatures aren’t quite as scorching as in the height of summer.