If you want to be in the heart of Lisbon this is the location for you. It is right by the Praça do Comerció and the streets right outside the door are lined with shops and restaurants.
The apartment itself is huge for Lisbon standards and extremely modern (even has a washer and dryer!).
The host is extremely accommodating and easy to contact as well.
I definitely recommend this location for anyone new to Lisbon as there is also a metro stop a few minutes walk away.