We spent two nights at Ines and Antonio's place and our sole complaint was with ourselves - why didn't we plan to stay longer? We were a group of two adults, two older teens and two children. The apartment is stylishly and thoughtfully designed and stocked: all the towels and bedding you'd need, comfortable furniture. The kitchen was stocked with all the mugs and dishes you'd need, as well as nice additions like a loaf of bread from the bakery downstairs, some jams, fruit, and a couple of beers. After staying in many AirBnBs with random, mismatched dishes, I appreciated that the dishes and glasses at Ines and Antonio's actually matched, and there was everything we needed - wine glasses, coffee cups, assorted utensils, a Nespresso with some pods, and cooking supplies (though we didn't really cook).
There was plenty of room for us all - it's not a big place but they have made good use of the space and the layout even affords a bit of privacy, particularly in the back bedroom. There is great art throughout the apartment as well, and lots of architectural details like exposed beams and woodwork - it felt like we were crashing at a very cool friend's place.
The location was ideal for a short trip where we wanted to be as close to everything as possible. We walked or took the tram everywhere, and had many great meals within a five minute walk of the apartment. Located as it is in a very popular and active neighborhood, the apartment does get noisy outside at night. However the windows are very high quality and kept the noise out entirely when we closed them at bedtime. With the windows open during the day, though, our kids loved looking down on the street activities below - we never turned on the television!
As stated in the advertisement, there are quite a few stairs to get to the apartment. We were traveling with only carry-on bags, which made the trek manageable. It might be challenging if you have a lot of heavy luggage or limited mobility.
Overall this is a wonderful base for exploring Lisbon - we would have happily stayed a week!