Yes both Portugal and Spain are amazing countries to visit. Their shared and separate histories, cultures and languages are very interesting.
But you don't have any idea about dates - shoulder season is not a term that is used widely in Europe.
Nor do you have any real idea about where you want to visit or what you want to do when you get there?
Restricting yourself to a particular hotel chain will also restrict your options for places to visit - have you even looked at the places they have hotels located?
You could easily spend 14 days in Portugal let alone Spain.
You really need to do some basic research first.