Travelers beware! A search on HostelWorld, HostelBookers, even GoogleMaps will tell you that Nirvana Hostel (now called Jaguar Hostel, by the way - Nirvana was a franchise that broke up) is on a tiny side street called Vishnu Marg, several hundred meters from the wall of the Pink City. This is not the case. Read the rest of their description of their address: Sirsi Road - Near Metro Hospital, etc. Different sites list the address differently. The property is actually about 6km or more from the Pink City, which is where everything in Jaipur that you want to see is located.
That said, the facility is quite nice, the staff is also very nice and it's quiet. This stems from the fact that there is absolutely NOTHING going on anywhere nearby. It's suburbia, Indian style. If you want a quiet place away from the bustle and killer air quality of the city, this place is right for you. If you want convenience, activity and sights-within-walking-distance...then try somplace else.