We stayed for a whole month at Maria & Pedro's place and we could not have been happier with our decision. The apartment was in a great location.
It was super easy to explore all of the Lisbon area from it. Cais do Sodre has tons of great restaurants and bars. I don't think we even hit a quarter of them in our time there. Chiado and Bairo Alto are practically next door and Alfama is a very do-able walk away. Even getting to places like Sintra and Cascais were easy with the metro and train station so close. There's also a running path along the river we utilized on a daily basis.
The neighborhood also felt very safe.
The apartment itself was clean, modern and spacious. There was plenty of room for both work and entertaining. The internet was reliable and quick, the espresso machine was great, the kitchen was very modern, and the place was quiet at night (there are some bars in the neighborhood, but closing the shutters also closed out most noise from late-night revelers).
I'd highly recommend a stay at Maria and Pedro's place!