This is a lovely cute and quirky apartment in a great location. Antonio is very helpful and keeps in good contact. The flat is fairly small but Antonio has furnished it really well. It was very comfortable for 2 people.
Interestingly, Lisbon is so hilly that after entering through the main building door, Antonio's apartment is on the ground floor, but walk through the flat and you find the balcony is on the 2nd floor above the adjacent street....best of both worlds!
The gas boiler is in a windowless kitchen and does not vent to the outside, but this was no problem for us since we kept the apartment windows open.
Note that we did an "Instant Booking" and later found that Antonio could not let us in until 7pm. It was too late to cancel without losing the extortionate airbnb fee; so we modified our plans to arrive late. In future if you want to arrive early then I'd recommend checking with Antonio beforehand.