This is so close to be a really fantastic place to stay in Porto. The location is great, super handy for public transport (especially to the airport!) and some really lovely things to see and do nearby, along with some great cafes and restaurants. Elisa was so helpful sending recommendations and quick to help when I accidentally set the smoke alarm off!
The only reason it's not a five star review is because there isn't an oven, only a gas hob, which is generally fine but does mean you have to improvise your cooking, and the TV could use updating to have some of the streaming services available. There also isn't a washing machine but that didn't bother me. Check-in is generally easy but I arrived at around midnight and there was a very panicked moment when I thought I wouldn't be able to find the place! Also, it does get very loud in the square at the weekend. I arrived on a Saturday night and it didn't quiet until at least 2am, but I only know that because I was still up and sorting myself out after my flight. I sleep with earplugs otherwise!
I stayed on my own and I'd say this would be perfect for one or two people, but no more than that. It's a lovely little flat in a great location with very helpful hosts. Recommend Noshi downstairs for breakfast and the bakery around the corner for an afternoon pastal! Primar was closed the week I was there so I can't say anything to that, unfortunately!