Not all of the Real Estate rental companies have short term rentals so that might be the issue.
Most of our clients who want a short term rental search on line specifically for short term furnished rentals. Are you looking for something furnished? If so go to a website such as vacation rentals as a key word when you search. Find a home or condo that you like and then click trhrough to that site. On some of these sites you can even book while you are there.
In any case if you do not get your answers please clarify for me: 1. furnished or not 2. price you are willing to pay. and I will email you back some ideas.