Amazing place.
In all the AirBnB places we stayed during our 3 weeks trip in Portugal, this was by far the best flat.
The location is great, you can sleep at night in silence, the flat is amazingly nice and inspiring, the little back terrace is a great spot to relax after a long day of visiting Porto.
I would totally recommend it, and if I go back one day in Porto, I will definitively check if this place is still available.