In a previous job, I booked 3x 2 bedroom suites or 6x single bedroom for 4 weeks at a Homewood or Residence Inn. Usually I would get $20/nt discount off the cheapest "public" website rate which is usually the AAA price. Sometimes, they would just give me the cheapest corporate rate they have in their system.

Just a benchmark for you to look at. I can't guarantee you'll get these results.