Rap and hip-hop stations here split along language lines more sharply than any other genre, and that is the most useful thing to know when browsing. American rap radio is widely available everywhere. French rap, which is the second-largest rap market in the world, is barely indexed in English-language directories despite having its own charts, its own lineage and a commercial radio station built entirely around it. German rap has followed a similar path over the last fifteen years.
The category also spans an unusually wide age range of material. Stations tagged hip-hop skew towards the nineties and the golden-age canon, while stations tagged rap or urban tend to play current material. Trap and grime have their own tags and their own audiences; grime in particular is a specifically British form with roots in London pirate radio.
Production-wise, rap is bass-heavy and vocal-forward, which is a good combination for streaming: the vocal survives compression well and the 808 does not. A 128 kbps feed is workable, but on anything bass-capable the difference at 192 is clear.