UPDATE:- Went out on a limb on Friday and ordered the Chicken Biriyani (extra-hot of course)…read more Superb - best (non-home-made) curry I have had in Düss - my new favourite!
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It's a bit expensive (but so are all Indians in Dusseldorf), and it lacks atmosphere at times. Service can be a bit ropey if the boss is not about, and come to think of it, so can the food. However, I go back again and again because despite its shortcomings, Mayur is the best Indian in town. If this restaurant was in London it would be 2, or 3 stars, max. In Duss it gets 4 to differentiate it from some dodgy opposition.
If you are a seasoned spice-lover you'll find the heat levels rather tame, so ask for them to make it extra-hot. Even vindaloo, which is my pick of the main dishes. They have recently started serving Himalaya beer, which is superb.