We had a really good stay at Helia's place!
She is easy to reach every time of the day and leaves nearby so she can be there any minute if there is any problem. We had a really good welcoming and she had great advices on things to see, restaurants and everything.
The center of Lisbon is a walking distance from the airbnb, there are supermarkets and restaurants really near.
The place is clean and big enough for 3-4 people!
I really recommend this airbnb.