The pros:
Our stay was fun and we loved Porto! Communication was clear and the self check-in was great, especially for us who arrived at a late hour.
Location couldn't be better, easy to access all interesting things to see in Porto and the metro.
Why not 5 stars then?
The flat itself is good enough for spending a night but it lacks certain basic things such as a sink to wash the dishes, kitchen, hooks to hang towels and stuff in the shower and such. Also, the bathroom wasn't very clean when we arrived.
My opinion:
I think if you need just a place to sleep and will be out all day then this flat will do its job. But if you wish to spend some time in or save money by eating at home you can certainly find better options in this same area for a lower price.