Almost everything you would want to see in Lisbon is a maximum 30 minute walk away. It's a beautiful safe area, super clean hotel, lovely suits, and great staff.
There are tonnes of highly rated restaurants around the hotel (Forno D'Oro and Koppu Ramen.) It's right near Parque Eduardo VII, Marques de Pombal, and Avenida Liberdade.
You can get directly to the hotel using the Metro or the bus from the airport (which I was able to do easily at 6am on a Sunday morning.)
Great experience and great spot. Suite was gorgeous and clean, the gym was decent - which I used a few times during my stay.