The flat is just as you get it from the pictures, lovely! We, my husband, 10 year old daughter and I, stayed at Carola's flat for 5 days during the olympic games. Great living space, good bed, great shower, quiet neighbourhood, it lived up to our expectations. The extra bed for our daughter was oke, but if you are over 12 years it will be to small.
We did not hear any noise from other neighbours. The flat was like a home for us.
A lot of atractions are within walking distance; the Santa Terasa tram is just a minute walk, the famous staires (escadaria seloron) is also close by. Casa de Bemjamin Constant is worth a visit, so are the ruinas. Nice restaurants, nice galaries/shops all within 10 minutes walk. The neigbourhood gives you enough to spend the day.
The streets and stairs are very steep, which adds to the great atmosphere, as well as the nice architecture of many buildings.
Carola is very quick in responding to your questions and her english is very good. There is a porter at the building that also helps you to find your way.