In general, this is what crews are looking for in a crash pad. Initial basings are about 6 months to a year.

Location
Price
Security and safety
Furnishings
How many people you will allow to reside in one apartment
Cleanliness
Honesty of the landlord
Reliability of the super if repairs are required.

These are just a few things off the top of my head.

Contact a short term apartment rental agency for further information. Or you can advertise in the local papers.