Great appartment - clean and well equipped. We got a bottle of wine as a welcome gift. Almost all the sights in the City of Porto are in 10-15 Minutes walking distance from the flat. Supermarkets are also very close. Only caveat: It can be a bit noisy at night (especially when the city of Porto decides to clean the streets with a leafblower at 2 am). If you have a light sleep you might have to buy some earplugs.
Overall, great experience!