For those considering to book the place, I write a small review, that I wish I got before booking, but unfortunately the host was not too responsive answering my questions:
The house is well located within Santa Teresa, in walking distance to some nice bars (e.g. Favela Hype - hip clothing store with live music gigs each evening), although the neighborhood is not recommended for those staying for a shorter period of time in Rio. For longer term it might be interesting because of the good price and not too touristy neighborhood - most of the people staying in the other rooms (really nice people) were staying for longer term and working from home.
The metro (Gloria) is about 15 min by foot on winding, deserted streets, which is okay during the day, but not recommended after sunset. In the evening it is better to take an Uber - lots of them rejects the trip because it takes more gas to go uphill, and the old streets can damage their car, so I usually waited longer than in case of other destinations - or alternatively take a mototaxi near station Gloria. The latter is good fun for the adventurous spirited, 5BRL/trip, you hop on the motobike behind a local guy and he rides you home uphill, be sure to take it at their dedicated departure spot.
There are no good supermarkets around the house (there is a small/expensive one), so consider buying your groceries and at Gloria (bottom of the hill).
From the street you have to take a spiral staircase of around 40 steps, no railing (not recommended for those with acrophobia), then more steep stairs to get to the house, and another inside the house to get to the room. The positive thing is that it keeps you fit but consider when booking!
As for cleanliness, my room was clean, but the kitchen/bathrooms/common areas not really, I didn't feel comfortable using them. The house has its charm, but it felt like that a maintenance would be necessary.
As for communication and arrival, it took 5 days and a follow-up message to get a very brief answer to my questions. Upo arrival, I found out that the room I booked was aready taken, so I got an other one. It actually turned out to be better, but still, to have no prior notice, it did not feel good. Oh and for Casa Jardim, there is actually no bathroom, as it looks like on the pictures, and the air of the room felt wet, so I would not recommend it. Unfortunately the pictures are quite misleading.
I usually don't like to give a bad review, but I would like to help future travellers choosing thei accommodation, especially when the minimum period of booking is 7 days, which is a considerable amount of time of the vacation.
To close it with a positive note: the other people staying there were really nice, and the house has a nice vibe. If you come prepared to all the things above, you will probably have a better experience.