We stayed at this funky apartment for 4 nights and had a great time. Silvia met us at the apartment, even though we didn't arrive until almost 22:45.
The location is awesome, right in the heart of Lisbon's old city and the metro & bus station within 200m
Silvia has got everything spot on, from maps of Lisbon to brochures regarding Sintra and much more.
Any questions you might have she will answer quickly and if she doesn't know she'll find out for you.
The only issue for some people might be the 5 flights of stairs.
Loved the stay.