Good places for Ice Age civilizations would be (on an initial glance) California (more water there back then, but the valleys are still here), the Parana (the desert nearby would basically do what Sahara did for Egypt and Gobi for Protochina), Straits of Gibraltar (good place for a Constantinople-like city; Iberia steppes and the protoSahara will ensure concentration of population), Western Greece (larger and colder than the OTL Greece, but still similar in some other regards), Congo (less rainforests, generally less humid), East Africa (more temperate than OTL), the Caucasus (between the steppes, the mountains, the Black Lake and the Caspian Sea, population concentration and external trade are assured, plus conditions are more temperate), Deccan (less humid, larger), Philippine-Japanese Seas (pretty good "mediterranean" area), and, ofcourse, Southeast Asia (more temperate Indochina, but I especially mean Sunda, with its complex river system, and all-around good terrain).