Porto is a great city and this was a good, central location. The apartment is big and sunny. It lacked a few things (we were there for 5 nights) that would've been nice. No light in the kitchen, no shower curtain, no where to put your things in the bathroom or really anywhere. No lids for the pots in the kitchen. Just the bare minimum of kitchen utensils. The furniture looks good, but there are no end tables or coffee table.
Other than that, I would recommend staying there! Easy communication and check in. There is a code for the door from the street and a lockbox with the key for the apartment. It's on the 5th floor, so up 6 flights of stairs or take the elevator. There is a lot of construction everywhere in Porto and several big projects right up the street. Also some loud construction during the day in the building and a lot of horns honking. It doesn't face the busy street, so pretty quiet at night.