Quote:
How much time we might need?

A year?

I found Rough Guide (to Paris in my case) excellent, but different brands have different styles and stess different aspects of travel, so I would recommend to take several (Fodor's, Let's Go!, Lonely Planet....)
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Dragi "Bonzi" Raos Q#5196 MkII #080000376, 18GB green MkIIa #040103247, 60GB blue