We didn't meet Joana, but some friend of her came at the hour accorded as we did an early check-in because our flight was arriving very early in the morning. Joana is always willing to help.
The flat is just perfect, even better than you can see in pictures, spotlessly clean, super big and with all the amenities you could need. She prepared a list with some things to do around Porto and places where having lunch or dinner. Location is just in the heart of Baixa (Porto historic downtown) but you can rest without any problem. The street is not very busy during the nights.
Wifi signal is working great in every corner.
Definitely even better than thousands of 3*&4* hotels around.