Great place + location (you can easily take the metro from the airport to get there and almost everything tourist-related you'd want to do in Lisbon is within reasonable walking distance). A ton of great, cheap food around the apartment as well and it's easy to access all public transportation as well.
Nuno is also very helpful - the internet was out one day and he was very responsive and dealt with it quickly.
Minor cons: stairs in the building are a little scary, even for 3 athletic adults. Check in is a little confusing, but they let us store our bags since we were a bit early so it didn't cause any issues!