The apartment has an amazing location close to many commodities (points of interest, bakeries, shops, restaurants, ...). We didn't miss anything in the flat which was greatly furnished.
We worked remotely during the stay and didn't have any Internet issues. The connection is really good and fast. If you want to work there, you just need to know that the wall from the bedroom is not fully complete so having 2 online meetings at the same time is challenging but still okay.
The balcony is not oriented to the sun so we didn't enjoy it that much as it was cold in Porto at that moment.
The quietness really relies on the neighbors. The apartment is calm from the streets but the walls are thin so it can become (really) noisy. During our stay, the current neighbors had a dog barking all day long.