Lovely, cosy apartment, bright and clean. Beautiful views of the castle and of the rooftops of Lisbon. The apartment is well located for the Martim Moniz tram station and a good base to start exploring the city. I would say that perhaps, the apartment/location is more suited to couples or families with older children, as there are steep stairs in the building (might be tricky with a buggy) and the area is not really young-family focused.
André is a very kind host and super passionate about Lisbon, he gave us some good tips of where to go and where to eat!