There is a fairly standard condo questionnaire that mortgage lenders will want the condo association to complete. Lenders are particularly interested in whether some units are in foreclosure or otherwise non-performing (not paying their dues) and also whether ownership is concentrated with anyone owning more than 10% of the units. I have not run across issues with the fact that a condo can be rented by the week. There may be some other issues regarding the financial health of the condo association. Of course, lender's will be interested in your creditworthiness as well. Good luck.
Chuck Braxton, REALTOR GRI