[Hijikata nods - that checks out. He'd give him a run-down of the basics that come with his spring alignment, but that other question is easier to answer.]

The red light district, mainly. Especially at night. It's in the city centre.

[Most people would have assumed that last part automatically, but Oengus isn't a city boy, so it's better to give more information than too little!]

Stick to the area around the Research Centre and other well-lit streets, and you should be fine.