You might want to have a look into using a cheap tablet and mounting that to the wall.
A Pi plus the screen (and any peripherals) makes things a bit messy.
There are a couple of loooong threads that you will learn lots from
The latter uses a framework called Dashing which is no longer supported and I wouldn’t recommend it. But it might inspire you if you wanted to learn some web skills 
There is an app for iOS Livo on iOS
Here is the LiVi manual, it is pretty feature intensive http://ctrl-h.de/wordpress/wp-content/uploads/2015/12/LiVo_2.0_Manual.pdf
Both platforms have very good remotes for Kodi and SqueezeBox. And of course there is HomeKit.
I think it is better to have many ways to control rather than the one. I can pull up a on screen display on the Mac Mini that runs the visual stuff in our house and use a HTTP request to send a command to openHAB, then use the Logitech Harmony, or a switch on the wall, or any phone or tablet (and yes, sometimes Siri).
That is one of the reasons I enjoy openHAB, it really does let you control anything from anything.