The apartment was great. We had 3 people but could have easily fit 4. The location is very central with nice views and an easy (but steep) walk down to the center of the city. Great place to be if you want to be near it all, but in a quieter area.
Don't try to drive in Lisbon. Parking looks nearly impossible everywhere. Our hosts met us at the airport and drove us to the apartment for 15 euros. Even though we got stuck in a long customs line and they had to wait for over an hour, they were all smiles when we arrived and we very kind.
We took day trips to Sintra and to Cascais. Both were easily done on the trains which were just a 8-10 minute walk from the apartment.