For visiting ghats, car is not needed.....
If you need it for Sarnath, BHU visit then your hotel can certainly arrange one...
As K _Yogi says ,you don't need a car/ driver for ghats and alleyways,but if you are visiting other sights like Ramnagar Fort,Sarnath,B.H.U. or Bharat Mata Mandir,you would need a car/driver,but as you say that you are going to stay in Rashmi Guest House(A Palace on River) they will arrange a guide and a car for you I guess.
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