Choosing a case for a mini home server

I have a PC/spare parts that I am considering to convert into something of a home server or the like. It has a Gigabyte B250M-D3H-CF motherboard, so Micro ATX form factor, as basic as it gets fan, and an ATX form-factor PSU, and no GPU. It, currently has a regular full-tower case, but I want to change it for something a good deal more compact for space saving reasons.

I haven't done any PC building in a couple of years, and never in small form factor, so what cases would you suggest?

For additional context, I am in Germany for the purposes of ordering and shipping costs.