The apartment is freshly renovated and thus is very good shape! You find everything you'll need: a fully equipped kitchen, a very nice bathroom, a large bed and some comfy chairs/sofas in the living room (+ a fine selection of photography books). The center of Porto is 20 min of walking away, but you can also take the metro or the bus if you prefer.
On top, your host is very helpful, providing a detailed map and explanation of Porto and available 24/7.
In summary, this place is a strong recommendation :)