I have a couple questions about the prisoners in Azkaban. I'll just list them so it will be eaiser.

Do we know where Sirius was in Azkaban. Was he at the top with the Death Eaters?

When Bellatrix and he husband end up there?

What other DE were there at the same time as Sirius, before and after he got there?

Do they have wizards working at Azkaban like at the bottoem or something? Or is it just only Dementors?

What do the cells look like besides the front with the bars? Would it be stone?

If someone could just answer one of the questions, I would be forever grateful.