We really had a great time in Lisbon during our stay with Ana and Mariana! Mariana answered all of our questions really fast and detailed, she also gave us a lot of insider tips of what to do in Lisbon and sent us their self-written Lisbon guide with recommendations of all kinds - just wow!
The airbnb itself was clean and had everything we needed, from a hairdryer to the coffee maker. You must know, that the appartement ist located on a really busy street which can be noisy throughout the day and especially at night; I didn't mind because I kinda like that, but people with a light sleep should know that. When you close the windows, it is almost silent and really dark inside because of the shutters.
The area in which the apartement is located is really multi cultural and very centrally located. There are little supermarkets, cafes and bistros and many options for local public transport.
If you're going to Lisbon, stay with Ana and Mariana - I can highly recommend it!