The apartment is very central and convenient to transport, being right uphill from both the Rossio metro and also Martim Moniz square, where Tram 28 ends and several buses stop. There’s also a decent sized grocery store there. There are several restaurants a couple blocks from the apt, including 2 good Portuguese, a Nepalese, and some takeaway places. Uphill, there’s a nice looking butcher shop and a small grocery with nice vegetables (and wine!). The surrounding area is largely immigrant, so there are a variety of African and Indian stores as well.
Note that the hill is pretty steep, and the apt itself is up 2 flights of very steep stairs, so if you have a problem with bad knees or any such issue it’s probably not for you. Once you do get down the hill you’re in the one part of town that’s flat, right down to the river.
The kitchen is small but functional. The bed is comfortable. The Wi-Fi and internet worked well, although I didn’t get good signal in the bedroom. There are extra blankets and a space heater for chilly days.