There are 3 routes in Portugal.
Interior - which goes from Farminhao and goes into Spain after chaves and then goes via the camino sana res to Santiago
Then there is the central way, which goes from Porto (or first lisbon to porto) to vilarinho, rates, barcelos, ponte de lima ect....
And finally the coastal. From porto to vila do conde, viana do castelo, caminha vila nova de cerveira. You then go inland to valenca or stay on the coast and go via vigo to pontevedra and then Santiago.
Looking at your plan, you are walking the central route. For this i would advise to walk from porto via matosinhos to Vila do conde (so first day on the coastal) and then on the second day go in inland to Rates, Barcelos ect
I did not stay in
casa da fernanda and not sure where exactly it is, but lots of people here rave about it, so i am sure you'll enjoy that