I just finished this map and at the end of the game (I past turns after domination victory just so I could get enough future tech health to let the city grow to maximum--during that time I did not add any more super specialists, I simply deleted the ones I got) and here were the final city stats:
Size: 47
Food: 94 (2 x 47)
GPP: 204 (leader was not philisophical, but did build epic)
Science: 1280 (running representation, 100% science, caste system)
Not a bad little city. As it turns out, it had both iron and coal in it's radius too (though I can't remember if the coal popped up or was always there), though I did not build the ironworks there, but the production was nice for wonders (and hence increasing GPP).
If that coal was there from the get go, I definitely think the best way to go is to start the first city 2 squares up (still have both coal/iron but also more plains/hills) and another to the south w/o overlapping as a cottage spam city.
There were plenty of 2 and 3 food source city locations for GPP too.