We found the location to be perfect. You can take the metro from the airport to the apartment and of course from the Martim Moniz station to all of Lisboa. You can also walk to Bairro Alto, Praça do Comércio, etc. The apartment is the definition of "less is more": simplistic but modern, clean, efficient and beautiful. The host Patricia was super nice. She waited for us as we arrived, offered recommendations and tips and was very responsive. Highly recommended.