Price data - You can get average listing prices, median sales prices, and avg. price per square foot by city, neighborhood or zip code from our Real Estate Guides or Heat Map.
Popularity data - on our Heat Maps on the far right column, you'll see a "Trulia Popularity" column which will show you what people are searching for on Trulia.
Below see a link to the Chicago Heat Map as an example. Be sure to zoom in and move the map around.
Your profile page says you are looking in Bulgaria; unfortunately we don't have coverage there yet :-)