This place is lovely, right in Alfama in the hustle and bustle of it! walking around here is so beautiful and you are a stones throw from Castelo De São Jorge. My top tip would be to get to the Santa Clara market on Tuesday or Saturday this is a must and felt very authentic Portuguese. Filipa is very helpful and quick to respond!
Also if you’re getting the metro to the apartment, it might be worth getting a taxi from Santa Apolonia if you have big luggage as it’s a bit of a hike up cobbled streets.