It was 4 of us there (2 couples) and we had an amazing stay in Altido Apartment. Everything was great, the apartment was very clean and the beds were so comfortable. We couldn't have chosen a better location, since it was right in the city center, close to everywhere by walk. People from Altido were very nice and helpful, communication was fast and clear. I would definitely recommend this apartment and would love to come back in the future when visiting Lisbon.
The wifi was a little bit slow for working, but if you need it just for social media scrolling, it's fine.