The flat is nice, well decorated and a good size for 1-2 people. The room has space to hang stuff and a desk, and there is a nice and spacious living room with a sofa and a table to eat. There isn't a lot of natural light coming in because there's a building in front, but the windows help.
The flat is well located, not necessarily in the centre centre so it's not loud and noisy but perfectly quiet and only a 10 minutes walk to Sao Bento or to other central places. There are supermarkets nearby (froiz) which are open till evening.
The flat was clean, kitchen utensils impeccable. It has all the basic stuff, not everything but all the necessary. It lacks some cloths or cleaning utensils to wipe surfaces and keep the kitchen clean and tidy after use. Towels were provided and body soap, which I used as hand soap as there wasn't.
You enter with a code, which is super easy and handy to not be carrying keys around. Unfortunately there is no chance to leave suitcases after checkout which is a bit inconvenient. Luckily, Sao Bento has some affordable luggage storage spaces.
It was good enough for a 2 days stay and for someone who likes silence for sleep and cleanliness.