The apartment is exactly as described: new, clean and nicely decorated.
We were welcomed in person by the guest and check-in and check-out were very smooth.
As someone already said, there were some ants in the kitchen, but this wasn't a big issue for us and it probably depends on the time of the year.
Also, it is a ground floor so it can get quite hot in the summer (we were there during the recent heath wave in Spain & Portugal, and although there is a fan, it wasn't enough).
The location is very good, you can easily walk to Barrio Alto and the center and there a lot of nice spots to eat/drink in the neighborhood.
Overall, I would say that this option is a bit pricey for Lisbon, but I guess this also depends on the fact that it was August (it is probably cheaper in low season) and that it is a new, recently renovated apartment, so we would still recommend staying here.