Hélène's property is such a value and a great choice if you're looking to stay in Bairro Alto/Chiado! It's located on a quiet side street, with routes to main roads with buses and trams either uphill or downhill. The Bica staircase is at the end of the street with bars, restaurants, salons, etc. for easy access-- plus great pictures of the Elevator. It's on the first floor so you aren't tired after walking up hills all day and has super cold AC. Nice updated bathroom (no outlet for hairdryer, though!) Kitchen is sparse, and no TV, but if you're in Lisbon and hanging out at home you're doing it wrong.
Hélène's property manager does not speak much English but we got along fine using Airbnb's translation and Google Translate. She was very attentive and even got worried after we got lost and were 90min late to check in. I believe she lives upstairs, so we knew she was close if there were any issues!
Highly recommend this place for the price. Perfect for a couple who just need a cozy place to sleep!