Brother 195/60 R15 is the best size.
185/60 R15 will lower your car dangerously. City is already a low ground clearance car.
If u have a good budget Goodyear Duraplus are the best tyres for this car will cost you Rs. 9000/ for 2013 manufacturing.
They are better than Yokohama C drive and Bridgestone AR10 in comfort and noise.
Not as good as the Yoko Advan DB or Continental CC5 but Goodyear will save you average 2500/tyre and will last approx 20K more than the yokos and DB.
Michelin Energy XM2 are also very good if you can get them for close to 9000 they are on par in performance with goodyear and noise and grip is even lower but their life is also much less than the GY.
For low budget LingLong Greenmx or L688 tyres or Toyo Proxes Cf2 or T1 Proxes R30 / 32 or Teo + are best and equally good to branded stuff for much less price.