I do not think it will be bad.
I have seen the BSNL wifi router working decently, diagonally difference of distance myst be 30+ ft, so I am sure this will do fine.
TP-Link products are decent much better than iBall ones which I see in the listing in Flipkart.
But yes the point sujay has put is correct in same floor it will cover more distance than one floor own, because of thicker RCC.