The apartment is right in the historical centre of Lisbon, in a wonderful and picturesque neighborhood. We visited a great part of the monument just walking from home to the center. It is very easy to reach, also with luggage, just 10 min from the train station walking.
The apartment is cozy and brand new, just renovated. We spent there 3 nights: everything was clean and Luis surprised us with a bottle of wine. He has also been nice and flexible with timing for check in and out.
I think this has been my best experience in Portugal in the 2 weeks I have spent there.