Don't hesitate and book your stay at the Lemon Cake House - it is a great place to discover Lisbon!
We had a really good time at Elisabete's accommodation. She and her friend Isabel were kind hosts who welcomed us very warmly, gave us incredibly good recommendations where to go for a dinner or for a day trip (and how to get there) and always replied immediately when we had any questions.
The house itself is a cozy and clean place and made our stay in Lisbon very comfortable. We would love to come back some day.
P.S.: The Lemon Cake is really as good as everyone says.. ;-)