I run just one Windows machine with some VMs for various services if needed. Less to maintain and have to tinker with.

I installed cable in a couple of apartments I rented. I just made it look professional and nothing was ever said about it. In one apartment town home I even had access to the attic and was able to run cable in the walls. I did have to drill through the floor and door headers in some instances, but it can be done.

I still use Dia Diagram Editor for most things. I just wish it was still being updated.