We stayed here for 3 weeks and had a wonderful stay. The apartment is beautiful and modern. It's also even bigger than it looks in pictures.
Pros:
Great area. We didn't know much about the area but Santos was an ideal place for us. It's not too touristy (in a good way) and it's happening/ close to the action. There are ample food options all around you, including Green Street (Rua da Silva) which is very charming. You are a short walk away from the Time Out Market which has many other restaurants and bars around it.
Nice building. The blue building you see in the pictures is the building. It has an elevator and nice interiors.
The apartment. We enjoyed all the windows and how nicely decorated everything is. Also worth noting that the view outside is charming with all kinds of alley ways and rooftops. There are multiple air conditioners in the living room and an air conditioner in the bedroom. The internet worked well. Also nice to have a dishwasher.
Cons:
While there is a washer there isn't a dryer. So you have to use a drying rack. We had a lot of clothing and the rack wasn't sufficient.
The air conditioners in the living room would often turn themselves off (I believe for power saving reasons). You often would have to go turn them back on over and over. The air conditioning in the bedroom was more consistent so temperature for sleeping wasn't an issue.
Overall it was a great stay. Highly recommend!