The apartment is fantastic. Very clean with all the amenities you need. They also promote being green; recycling, being wary of electricity and water usage. The kitchen/lounge area is on the ground floor at street level. You then go down into the basement for the bedroom/bathroom area. The place is modern and designed well, I liked how it was built into rock on the basement and some are still visible. Having a door code is so much easier than carrying a key round as well.
The apartment is very central to the popular restaurant/shopping area and about 7 minute walk to the river. It's also situated near the medieval part of the city amongst tiny and historical side streets so you can get a lot of tourists as well as locals walking past. It's not noisy at night or early in the morning so perfect if you intend to spend the day in the city rather than in the apartment. And being located here means there are some more authentic restaurants & shops nearby.
Claudia was an excellent host, very helpful and quick to reply. I was also lucky enough to check in early and check out late which was so helpful with my luggage (but there are luggage lockers at the nearest station, Sao Bento).
I would stay here again and I would recommend it.