We traveled with 3 kids in august 2019.
The building is recently renovated in an excellent location 2 blocks from the time out market with good restaurants but if you're looking for that classic European street this one is more modern.
The bedrooms and the living room all have good (and super quiet!) A/C which is a must in august. The living room is very spacious, comfortable and modern.
Beds are excellent and very comfortable !
Kitchen is pretty large but basic if you intend to prepare all your meals there.
The place was very clean, we did have an issue with the water heater but I think It's fixed now (it was set too high)
There are no stairs required and an elevator which is great, also, ramps make the apartment easily accessible to suitcases (and wheelchairs, presumably).
This is a good choice for a stay in Lisbon with family or friends.