We just heard about a nifty web tool for figuring out the average amount of rent for your neighborhood.
Pop in your address, current rent, number of bedrooms and units in the building. The Rentometer analyzes the property and gives you a report.
You get a "meter" which plots your rent in the range of low, median or high rents for your specific area. You also see a google map with clickable points telling you the rental price of same-same size units close by.
Now, certainly this is a very general report, as amenities and condition of apartments vary greatly. But considering ease of use and amount of information given in return, we think it is good research tool for renters looking to negotiate, when considering a neighborhood change or just to plain old satisfy curiosity.
Currently works for the US, Canada and London. Check it out here.