The location of the apartment is perfect, and it was very easy to check-in, Abu even allowed us to leave our backpacks in the room before the check-in time without problem.
There were a few details not so good as the mattress (too thin), everything could be more clean and with more basics such as blankets and napkins in the kitchen.
Also have in mind that there are 6 or 7 rooms in total and that other visitors can be noisy at night in such an antique building.
Overall for the price and in such a touristic city as Lisbon it can work for a couple nights :)