I very much enjoyed my one-month stay at Sofia's Airbnb. The location is perfect as it is situated just outside one of the most lively and beautiful sections of the city, yet is extremely quiet as it is nestled on the top floor and several buildings inward from all main roads. In the opposite direction, there are two good coffee shops, shops, and some excellent, less-touristic restaurants compared to what you will find plaguing the East side of the Barrio.
The apartment itself is very nice and modernized while retaining the gorgeous wood floors, and as a bonus includes a dishwasher and most importantly, a washing machine. There is also a baby Nespresso machine in the kitchen, while the store is just down the road. The hot water heater never fails to deliver warm water in the shower. The Internet connectivity is simply a 4G hotspot (not portable), but worked very reliably during my stay. If you're tall as I am, know that you may hit your head in some areas within the apartment, but I believe this is typical of Lisbon.
Overall, as someone who has stayed in the apartment for nearly one month, I absolutely recommend it, highly. Lisbon is a wonderful city, and I am very glad I chose this Airbnb. Thank you Sofia!