Comment by lunias
> some way to remote control the computer from the couch (ideally from a phone)
If you use Kodi then you could try Kore (their remote app). I tried it once a long time ago and it was alright, but it's hard to beat a keyboard. I think similar apps exist for VLC and other media players, but I haven't looked into a solution that allows controlling the entire computer via a phone.
The huge problem with Kodi is that it requires playing media from within Kodi. The advantage of using a PC for this is that it works with anything you can play from a PC, regardless of whether someone has made an app for it for Apple TV or Samsung's smart TV stuff or Kodi.
You need to be able to provide keyboard and mouse input from a phone. Not just control Kodi or VLC.