The building an place is impressive by its size and beautiful Islamic architecture. However, hard to get there as it is in the middle of Old Delhi, with crowded street and people is not too friendly, not to say sometimes aggressive. Women must wear a gout (of course, they rent one there) and on our way back two guys came after her shouting and for a second we were not sure if we comitted some heresy or we were being mugged at the mesquite, but they just wanted their robe back, in a very unfriendly manner.
We were part of a bigger group, which give you the sensation of some security on the numbers. If you by yourself and are not muslim but just visiting, you have to be very adventurous.