This is an ideal spot to explore Lisbon from. In old city with Bica tram passing the apartment, two subway stops within 10 minutes and major shopping district a short walk. Plenty of restaurants options of all prices. Be sure to check out Arco da Velha an antique shop/bistro/tea house/bar, and the big food market at Cais do Sodre nearby.
The unit is nicely decorated and kept up. Samuel has stocked the kitchen with everything. Bathroom and shower is teeny; think camper and you'll do just fine. The beds are comfortable. A corner location on a street with plenty of nightlife means a fair amount of noise.
We were fortunate to meet Samuel mid-morning after our trans-atlantic flight to check in. He also had many tips for seeing local attractions.