Céu's apartment was amazing, and I recommend it for small groups. Me and 2 friends had a wonderful time there. Rodrigo met us to give us the keys and provide a helpful orientation to the apartment and allowed us to ask him questions about Lisbon. The view from the balcony was breathtaking. The apartment was clean, the bed was comfortable, it was a great value, and well located, not far from the Pantheon where there was a market twice a week and some really good cafes/restaurants near. This wasn't a party neighborhood, but a chill area with nice options for food and coffee (some of which were closed for August vacation). It was important for me that the apartment itself was nice because when I got tired from all the exploring, I spent a lot of time lounging in the apartment.
Be prepared for a workout going up to the third floor of the building, but you have to be prepared for that anyway walking around the streets of Lisbon since it's a very hilly (and beautiful) city. Thank you, Céu! I can't imagine a better place to stay.