Overall, we had a great stay at the apartment. The listing and photos match the place exactly - it's even a bit bigger than it looks. The kitchen is well stocked, great A/C, comfy beds, and other amenities. They left us some pastel da natas, local wine, and written instructions on the apartment.
The location is really great with great restaurants in the immediate vicinity and easily accessible to both Old Town and other areas.
The only slightly down side is the check in process. It does require someone to meet you at the apartment so timing may be a concern. But, it goes quickly and there are some quirks to learn. This is managed by an apartment service, not necessarily by the owner.
Important to note, the apartment is on the fourth floor but the elevator leaves from the second floor - so be aware that you will need to carry your suitcase/bags up a flight of stairs to get to the elevator.