Good stay; had the room on the first floor across from the kitchen so it was convenient. Comfortable bed, good shower, lots of natural light. (If you peek your head out, you'll see the tower of the church) Many great restaurants and bars nearby. (I enjoyed Have a bite - drinks & snacks and VOLTARIA.) There's no washer but there's a lavanderia/laundromat close by; it was easy to use.
Some minor drawbacks would be that there's no place to put your clothes or hang your clothes. If they had a dresser/drawer under the bed that would help out a lot. Also there were no coffee pods in the kitchen, but there are plenty of places to go for coffee early in the morning.
You should be aware that there is a long-term construction for the metro that is blocking the way to the apartment from São Bento station. You just have to learn how to cut in between buildings to get to the apartment. (You can't always depend on map apps on your phone.)
But in any case, I still recommend this place; it was easy and convenient with no snafus and host was super responsive.