Relatively clean but dont expect anything compared to western hotel standards. Fittings are very old and barely working, e.g. the shower head in my room was not working and the temperature could not be adjusted.
That said however, safety beats all and this is a very safe place, especially for solo travellers.
Staff is super helpful, especially in a city like Delhi which is quite tedious to move around. They can also help with tours, drivers etc. as the hostel manager has a tour company also.
Overall, decent quality if you're not too picky. Price could be lower, as current does not reflect the facilities.