Marco's studio is clean, with a great bed, a kitchenette with hotplate, and modern WC and shower in a frosted enclosure. It has a window view of the Castle and surrounding neighborhood. There are lots of little shops nearby including a health food store, and restaurants abound.
A couple things to note, the interior stairs are very steep, bring face clothes, and the coffee setup is for expresso.
Located 10 mins uphill from the Martim Moniz subway stop and near the number 12 tram line, it is a good location to explore Lisbon from.