"The address mentioned on that site is 10 mins away from where I live.
So, I know that there is no Bitcoin exchange over there. "
very strong statement that will build doubt for sure if this address that has been provided is not existing a possibility of a scam site hope no one got into the net of scammers, arbitrage is good but that big difference from current price is too suspicious better to review and and assess properly before doing any trade.
The simple statement about reviews is: "you cannot review something if you do not have any experience it."
In this case it goes: 1. trade 2. review (it cannot be: 1. review 2. trade, as you mentioned).
My experience was a pleasant one, so my review still remains positive.
In retrospect, whenever the rates from an exchange site is a wide mark off the track, a grand scam is simply in the making - see Mtgox and Cryptsy. The fact they fixed a minimum amount to trade and as high 0.5 Btc and putting Paypal forward as payment system unless one is dealing in the region of 20 Btc, is enough red flags to decipher where all these is headed.
The fact, you have gotten away with your first transaction is no guarantee, the next would be all said and done. from experience, they won't strike yet, until a good number of gullible people are off their guard.