Petronela's place was great! The apartment was very clean and had everything we needed for our short stay in Porto, even equipped with a microwave and mini fridge. Also great water pressure if that matters to you. You're also surrounded by 4 restaurants the moment you step out so eating won't be an issue.
The only thing is that it can get a bit loud during night time because of those restaurants, especially if you like leaving the windows open. It might matter to you if you're a super light sleeper but definitely not anything too terrible!
Overall, a nice stay in the center of Porto.