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Hostel life in NITK is going to teach you much more about yourself than anything else in college. You learn to adapt to any (and I mean literally any) situation, you learn to manage cash flawlessly, and most importantly, after 4 years here, I'm sure you'll be filled with a sense of confidence that you can survive just about anywhere in the world. Now to answer the specifics. About amenities. Water, power and internet are all there about 70% of the time I guess. Power and water become little short in the summer months but its generally manageable. Internet is fickle from time to time with regards to speed and blocking of sites (*wink*). The sports complex is right in the middle of the campus and the ground is filled with a number of games (of varying degrees of competitiveness) occurring simultaneously unless its either pouring rain or searing hot. Weekends are split between exploring Bangalore, making plans to go on trips, going on trips, doing absolutely nothing at all (an NITK Special) and in late November and April, slogging. Regarding your specific questions:
Boys generally don't have a curfew as such. Only in first year but this too can be managed if you make friends with your hostel guard. Now gates are being closed at 10:30, but atleast one is open at all times which means you can literally show up when you want. Girls on the other hand have strict curfews ranging from 10 to 11 30 based on which year your in. As of now, no separate DASA hostels. Shared bathrooms only Im afraid. There cleaned at least once a week but cleanliness often depends on the members of your wing. Usually from second year on wards you choose your wing mates so the situation gets more eased. But there are times when the situation becomes a little outrageous.
Room conditions are again completely dependent on you and your roommates. The staff do come to sweep your room at least once in 34 days. Co-ed hostels? Are you serious! What do you think :p
But on the whole its been an awesome experience, you'll meet some great people and grow a lot in your time here.