I ended up staying at Amelia's place for longer than expected; it's a cute little place that hasn't been 'done up' in the classic airbnb style. The location is amazing, and is why I chose it; the Jardim de Flores in Sao Bento has a lovely vibe with a mix of local and international folks, and is in a reasonably quiet area with no major thoroughfare, which keeps the road noise down.
The apartment itself has neighbours above and below, both of which were ok, and the stairway is fairly noisy. Internal sound-proofing isn't great, external sound-proofing is ok. There is a nice view out the back to the internal gardens that is very green and pleasant. The floor in the lounge and bedroom is not level, which made for interesting yoga sessions. The kitchen floor is level. I asked for salt and pepper and some washing machine tabs and didn't receive them, which is a shame - not a major, but it's nice not to have to buy all the little essentials when you're travelling. The kitchen is basic and gets most of the natural light. The interior of the lounge is done in very dark wood, which is apparently a thing in Portugal. I wouldn't want to stay in here in winter, as the insulation is poor.
Overall, I liked this place for the location, and it was reasonably cheap. I would stay again.