We had a great time in the apartment ; everything was perfect from our arrival to our departure ! Nice bottle of wine, nice terrace. Just a thing though : you don't wish to keep on advising Baixa district to your hosts as it is hard for tourists not to get scamed around there. Restaurants tend not to be honest on the price of their product as we found ourselves paying 117euro for a meal that was not worth it. However, we also found another restaurant closer to the apartment and it was delicious and not expensive !
Monuments are gorgious, musea are great, the Oceonario is also great...
The numerous little streets of Lisboa are magic.
PS : there is a great great terrace bar named Miradouro da Graça 5 min away from the apart with a wonderful view. Go there, you won't be disappointed, by the way prices are low.