What they arranged was 50% more expensive than if you arranged by yourself. they also charged fees for find an apartment for you. For them it is just about business and money not helping.
Si j'y retournais je choisirais: Appartement/maison
Pourquoi?
This gives you the best opportunity to experience the student life of Lisbon students. It also give you freedom to decide what you want to do with your time.