We had a great time in the centre of Porto. The appartment is light, clean and has a nice interior.
Since we arrived and departed by Uber I'm not sure what the public transport connections are like, but since it's the city centre they're probably quite good.
Everything you would like to have on a trip to Porto is nearby (River Douro, great Restaurants/Bars, supermarkets and boutiques).
The communication with our host was very nice, quick and informative.