I went there yesterday that is on 18th of June 2017 and it was crowded because of the obvious reason that it was a Sunday. But this holy place is a must visit place in Delhi. I have been in Delhi from the last 7 years and I was wondering that why I have not visited this peaceful place.
If you are planning to come through metro you may drop at Patel Chowk or Rajiv Chowk. The architecture and the atmosphere is awesome. There is no photography restrictions. Like any other Gurdwara there is a Langar and the facilities that the volunteers provide and that is praise worthy.