Any agency in Boston equipped to do rentals will run a credit report for you when you apply for an apartment. It is not a bad idea to check ahead of time so you know where you stand. With a score below 600 it is a good idea to have a co-signor ready before you apply for the apartment.
Most agencies will run a credit report as part of the application process - it is one (of many) reasons why landlords chose to use the services of a real estate office. It might be prudent for the renter to pull his/her own credit report before making an application to know what is on the report. Consumers have the right to receive one free credit report (from each of the three reporting agencies) once per year. These reports will not include the credit score but the consumer can access that number by paying a fee, and it is often a good idea to do so because some landlords will only look at the score. A good real estate agent will guide the landlord to the important aspects of the content of the report and (sometimes) this education will result in a change of mind on behalf of the landlord.