Patricia's place was in an excellent location: right next to Alfama, close to restaurants and train/rail stations, and steps away from the riverfront. It is not in the exact heart of Baixa so it is still quiet enough (you will still hear the tram pass by).
The apartment itself was clean and cozy, equipped with a simple kitchen and fridge. It was perfect for a solo traveller. I would recommend just based on the value for location compared to other listings nearby.