My boyfriend and I visited mid August, and stayed at Pedro and Elizabete's place, and I must say our experience was effortless and great! Right from when I booked the place to arriving, Elisabete was welcoming, gave good instructions for check-in time, and had many recommendations for things around the city.
We met Elisabete in person during check-in, and the place was as spotless as the reviews and listing mention. The place is cozy and more than big enough for a vacation trip. I will note there is no AC, but they do have a large fan and the nights were cool enough that you could sleep with the window open and get a nice breeze. The neighbours are quiet, so that was never an issue.
Right when you leave the complex, there is a small cafe that has pretty great toast as a pick-me-up in the morning. The apartment is only minutes from a bus stop and metro stop (Rato) and about a 30 minute walk to the Baixa/Chiado/Alfama area! It is hilly, but the sites make it worth it.
Elisabete and Pedro were great hosts, and I would highly recommend staying at their place if you make a trip out to Lisbon!