Does it really have grip shifters on a road bike? Looked at the bike on a search. Seems to not have best reviews but for that price it wont. Id only buy it if its something to get you by till you get something else later cause I dont think you will be happy with it.
Find a used bike that fits. It may take some patience for the right bike to show up on Craigslist, but you can hopefully find a decent old bike from a quality maker in that price range. Something like an old Trek.
New bikes in that low a price range are often so cheaply outfitted that they're not worth buying.