March is the superb time to visit Varanasi
You should plan at least 3 day trip . Two days to explore the local Ghats , Gali , shopping and eateries in Varanasi and 3 rd day in Sarnath You can check for accommodation on Booking.com
March is good time, i stayed at hostel Assi which was near to Assi ghat. You can get the best deals on booking.com. Explore all ghats from assi to manikarnika, it's truly a heritage walk.
Don't forget to witness Ganga aarti, pay visit to kashi vishwanath temple.
If you are a foodie don't forget to have some lip smacking chat at kashi chat bandar.