We LOVED our stay at Nuno & Raquel's flat. It was beautiful, comfortable, stylish, well stocked and cozy. We stayed There were thoughtful touches like monogrammed towels and sheets, nice soap and shampoo from a local producer, and some beer and juice in the fridge when we arrived.
We stayed in Porto for 7 days / 6 nights and found this apartment to be perfectly centrally located. It was within easy walking distance to the train station, main square and the Dom Luis bridge. Local shops, restaurants and activities were all close. As were the port wine cellars just across the river.
The closest grocery stores were a bit of a walk - but found just going to multiple little shops that specialize in one thing is better anyway (or just going to the local Bolhão Market).
Raquel checked us in in-person and showed us around and also messaged us a couple of times during the trip to make sure we were doing well. I'd highly reccomend their flat.