Really lovely and comfortable apartment in a fantastic location. I would definitely want to stay there again.
Lisbon is a wonderful city to visit and Alfama is a wonderful neighborhood to stay in. The apartment was a short walk to the center. Just down the hill from the apartment is the Santa Apolonia train and metro station so you can get everywhere very easily.
Be aware that although you use the same paper reloadable card for metro and train, you need to use a different machine (train vs metro) to load "products" onto the card if you want to load a single trip. Look for a red M on the metro machines. Also, you can only have one active product on the card at any time. This means if you have a 24-hour metro on your card, you have to wait until it expires to buy (for example) a train ticket to Sintra. Otherwise, you need to buy a second card (50 cents) for the train ticket.
If you have difficulty with (2 flights of) steep stairs, this might not be the best option for you. We liked the building and had no trouble with the stairs.