IIT Delhi has a total of 13 hostels - 11 for boys and 3 for girls.
In terms of cleanliness, security, network service electricity all the hostels are decent and provide the necessary means for a comfortable stay.
Old hostels: The old hostels lack a few amenities. One big flaw is the lack of lifts despite the hostels having more than 3-4 floors. Moreover, there is only one water filter on the ground floor and it’s a big task for students to come from 3 floors to the ground floor to fill water bottles.
The new hostels have better facilities and even have lifts and water service stationed on every floor. The rooms are also bigger in comparison to the older hostels. Every hostel has night canteens that offer food at subsidiary rates.
Washrooms: The washrooms are cleaned daily and hygiene is maintained. You even have geysers for winter.
Girls' hostels: Everything is very substandard in girls' hostels that are located on a drain because of which a foul smell prevails on the campus throughout the day. The rooms are very few in comparison to the strength and the food served in the mess is pathetic. Availability of rooms is a major problem there and the mess food is pathetic.
IIT Delhi hostels indeed are well maintained but it's important to note that the facilities provided vary from hostel to hostel.