Recommendations on areas to live in the Norte. (Bogotá)

Hello I'm new to Internations and was hoping members could makes suggestions about areas to live in the Norte. I'm currently living in Usaquen but have to give up my flat. My Colombian friends have recommended a flat on Calle 45 and Cra 6a but I don't have any experience in this section of Bogotá. Any suggestions or recommendations? Many thanks..