Really good service from the hosts. Carlos picked us up from the train station and drove us to the flat. He gave great information on the way and then dropped us off in the town center afterwards. We weren't able to make phone calls, so Elsa called a restaurant to make dinner reservations.
Lisbon is not a hard city to get around, this flat is on a quiet street, but just a minute walk from the main tram line that takes you throughout the city (~15 min to the center and closer than that to many other things). I would recommend staying with Elsa and Rui at any of their places.