We definitely recommend this and will gladly book it again on our next visit to Lisbon.
2 little tips when you book the apartment:
A very narrow staircase with steep stairs leads to the apartment. Also in the apartment itself you only get over steep stairs into the second bedroom.
The two double beds were only equipped with only one blanket per bed. If you are not a couple or do not like to share the blanket, then I recommend to announce this in advance.