If you're looking for an apartment for a short stay in Lisbon this is THE apartment. And Tiago is THE host.
It's central located, next to Avenida da Liberdade: you can easily walk almost everywhere, and the Underground is about 2 minutes walk.
It is not very big, but has everything you could need. Most amazing things are windows (the house is full of light) and the rooftop.
Tiago is a very kind guest. He speaks a fluent english and was always ready to help us for any of our needs, both before our arrival and during our stay (he answers almost real time to sms!). The day of our arrival (Christmas!!) he was at the apartment waiting for us with a piece of cake, a cheese, some fruit and a bottle of wine.
In addition he placed maps, personal notes and suggestions with restaurants/points of interest in the city and in the neighborhood.
The area is safe, and full of small restaurants.
I would recommend this solution for a visit to Lisbon not only to other airbnb users, but also to my friends.