Paula & Rafael's apartment location made exploring Porto very easy. They have a nice check-in app that allows you to access the front door and apartment via an app & code. Just make sure you have cell phone service when you arrive so you can access it. There is also good sound proofing and we did not hear any street noise or neighbors.
The apartment seems to only be used as a rental however, so it did lack the home touches we have grown accustomed to when renting through Airbnb. The experience felt a bit more like staying at a hotel without any hotel services. The apartment is minimally stocked, and we purchased dish soap, paper towels, toilet paper, and conditioner. We were mostly out and about so it ended up being fine, but it would be a tough rental to do a lot of cooking in as the appliances are a bit worn down from previous guests not properly caring for them. If you are looking for a spot to sleep and shower and plan to be out and about in the city it's a good option.