Charlottes place is perfectly place for a short stay in Lisbon. Placed in the centre of the wonderful Alfama district. With bus and two tram routes outside providing easy, fun transport to and from the airport. It is near the castle and close to the centre of town. The amenities are adequate, plentiful and clean. The view is a bonus if you want a break from walking around the town. I would say you need to be fit and well to stay there as there are a lot of stairs to climb as the flat is in the loft, plus a short but steep ally to get to the flat itself.