Our experience was really good. The Bica neighborhood has an amazing atmosphere and it is very well located: Close to the center, supermarkets, stations and nightlife area. The apartment is exactly as in the web. Very well decorated, modern and simple. The host was very kind to leave some fruit, water and wine for us. And the kitchen already had some basics needed for cooking as well as all the required tools.
Only thing is that access to the appartment is through some stairs in the street and the building. But in Lisbon you will need to get use to it. :)
The appartment windows open to a lovely little square with the "elevador". There is some noise because of this and the bars with terraces in the square that willl keep you up until late if you need to leave the windows open becuase of the heat.