We had a great stay in Petronela's apartment! It is lovely decorated, super clean and perfectly adequate for a holiday for two. Although it is a ground floor flat, the apartment only faces a quiet backyard. The location is perfect, directly in the old town and close to the river, the bus and train station.
There is only one negative thing to add, which is that the apartment has just one big window, which makes airing a bit difficult.
Petronela is a great host! She is very welcoming and gave us many tips about what to see and do in Porto. An early check-in and a late check-out were possible :)
Thank you Petronela, we would definitely come back!