Sofia and Matthew's apartment is probably the nicest Airbnb place I've tried. It's huge, extremely beautiful, modern, clean, furnished with everything you could need and perfectly located in the heart of Porto. It will make you instant jealous.
Sofia is a great and very accomodating host. We arrived pretty late on the first day and she found an easy way for us to get the keys. She's also a really good communicator. And she offered us a box of pastels de nata... which were delicious.
Book! You won't regret it.