PV Paramandra Vihar Hostel is the best at SASTRA University. A few of my friends stayed in PV. According to them, the facilities offered at the hostel are good. There are no water problems. Although at other hostels, you will face this problem from time to time.
At PV, the hostel fees are also quite less. There is good ventilation. So, even if there is a power cut, you can sleep well. The only problem is the mess. It is situated on the ground floor and there are only two staircases. During rainy seasons, it gets a bit difficult to reach the mess.