In the home we will hopefully close on towards the end of this month I will have a room for just my hi-fi/guitar gear. I've attached a pic of one end of the room taken from the wall across from the staircase entry. It is approximately 12x19. The wall I'm taking the pic from is straight from the floor to the highest point in the room, not angled like the other side.

The floor is a hideous tile that needs to be dealt with. The hi-fi gear will go at the end without the bar (the bar is inset into the wall, with the "short wall" on the other side of the staircase being even with the front of the bar if that makes sense?). I plan to put a small loveseat with a short back for a listening "chair" in the room.

Any ideas of wall treatments to use/avoid and floor treatments to use/avoid?

I know the room is an odd shape on one side with the angled ceiling, but I think it will work fine when everything is set up because it will be fairly nearfield at 10 feet or so distance. If not I'll get a decent EQ to deal with the room shape.