I don't look at other people's entries before posting my own lest I subconsciously nick ideas, so -
Euio, I really like the name 'Khanate of the Danube'.
Yeah, I was upset when he'd used it and I had to rename mine
Dutchie, like the style, seems as though the north/south Chinese divide is persisting even after the conquest of the Song, Poland and Austria seem to have got back on their feet rather quickly...
Thanks - I figured with another Khanate in the West, there'd be lesser men in the East to hold the core Empire together, resulting in the North/South, Steppe/City split in China.
My thoughts in Europe were that the Mongols would confine themselves mostly to the Pannonian plain while the border regions with the HRE and Ploand/Mazovia would be generally depopoulated through enduring raids and skirmishes. Most of Central and North-Western Europe was not suitable to the Mongol society (too many forests). While they integrated with the Song Empire in the East (there's an old saying that conquering the chinese is like the water conguering the sponge), the cultural (and, sadly, racial) differences with the urban Europeans meant integration wasn't possible.
The presence of the "big scary foreign devils" led to a more unifed HRE, under the banner of protecting the true faith form the Eastern Horde. Poland and Mazovia unified in the face of the threat, but again the lands weren't suitable to the Mongols, and so their main threats are the Teutons and the Novgorods.
What I liked the most was the surviving and stronger Latin Empire. The Khans defeat of the Seljuks and Bulgarians allowed this Constantinople Empire to thrive. They beat and integrated the Niceans and most of the Greeks to lead to an Agean empire.