My family (two adults, two teens) stayed in this lovely apartment for a few days, and were very pleased with the entire experience. It was our first time in Porto, and we wanted to stay in the Ribeira (old city), close to the Douro River, yet a little bit away from the bustle (if you can call it that).. and José's apartment ended up being exactly what we were looking for.
First, I'll talk about the apartment. It had everything we needed, including comfortable beds in each room, a very nice bathroom (big shower with rain fixture), and a fully stocked kitchen. Everything was very clean. The couch/futon in the common area was big and comfortable (was nice to nap on). There is a cute outdoor secluded terrace with a table. Even though we didn't use it much, it was nice to step out, get fresh air, and see the neighbor's lemon tree (with lemons as big, or bigger, than your fist).
There's a TV (which I'm not sure we used but once), and ample WiFi. We all did plenty of web surfing in the evenings, as well as some work, and always had plenty of bandwidth between thee four of us. There's a cell tower right across the street, so we had strong 4G on our Vodafone SIM cards, too. Oh, and there's a nice air conditioner.. so if you prefer air to be a bit crispy and cool, like we do, you'll be very pleased.
Second, the location -- honestly, it's perfectly set. Being close to the river, it's at a lower altitude.. and if you've been walking the streets of Porto all day, going up + down + up + down, having your the last stretch of your journey home going downhill is a huge bonus! You're just a stones throw from lovely restaurants and cafés, and small hike to super mercados (convenience stores). If you're having an extended stay, you may want to do laundry, and there's an amazing self-service laundromat just two doors down (all wash cycles include detergent + softener, so don't go buy/add your own).
And just past the laundromat is a gem of a restaurant (O Bom Talher). Highly recommend. Everything we had there was delicious.. and that's coming from a family with diverse ranges of tastes/preferences. We only wish we discovered it earlier in our trip!
The location of the apartment felt very safe (well lit outside). There were plenty of local folks / families around, which we prefer to being surrounded with tourists. It's a great experience and space, whether traveling by yourself, or with a small group/family. We'd stay here again in a heartbeat!