This is a great apartment in a fantastic neighborhood. Nestled in a quiet alley, the apartment has all the necessary kitchen items, incredible views of the river and nearby Pantheon, plus plenty of comfortable living space. On top of all this, the hosts were great at communicating with us beforehand and were very welcoming and helpful when we arrived.
Santa Apolónia station is a 5 minute walk from the apartment. Here you will find the Metro (blue line) and a supermarket inside the station.
As previously noted, the apartment is four flights up with no lift. The walk up is worth the rooftop deck and views.
The only negative comment we have is that the wireless internet is rather weak. We experienced extremely slow uploads/downloads which made it impractical and unreliable when we had to do any actual work on the Internet.
Overall, I would recommend the apartment wholeheartedly and I would stay here again next time I am in Lisbon.