A second possible solution could be getting an unfurnished rental and getting rental furniture for the period of time you need it. I deal with these companies all the time as a real estate agent/stager and you can wind up with a great look.
Another furnished short term rental might be one of the residence hotels on Long Island. If you need more detailed information, just let me know.
Whatever you opt for, I wish you luck.
Tom Brady SFR, e-PRO, SRES, BPOR
Licensed Associate Broker
Notary Public, Retired N.Y.P.D. Lt.
#1 Listing & Selling Office on Long Island
Charles Rutenberg Realty, Inc.
255 Executive Drive - Suite 208
Plainview, New York 11803