Good location but difficult for taxi/uber to reach. A residential neighbourhood - therefore expect noise and liveliness. Staircase is very steep and uneven (a feature of old buildings) and requires extra care else dangerous.
Nice apartment overall - clean, functional and with freshly laundered bedding and plenty of towels, etc. We were a family of 5, so two double beds and a sofa bed were fine but the second bedroom is very small (just barely enough space for the bed and a squeeze at that) and without natural light - ie no window!
During the night (in November), the place can get very cold and there are portable electric radiators available.
Communication before/during with Mario was easy and fully responsive and immediate.
Self check -in and -out was perfectly easy by use of lockboxes for the keys, although on first arrival it took much effort to to locate the address due to confusing house numbering system in local use (there are two number 25s within 150m on the same street).
Good place to stay in the Alfama district of Lisbon and I'd use it again.