I am modifying this exercise to fit my goals, can’t find the need for any such wall/window just now…
… but procedural wood! On the floor 
… and of course now the Shelf, table and bench looks like chipboard… 
I am modifying this exercise to fit my goals, can’t find the need for any such wall/window just now…
… but procedural wood! On the floor 
… and of course now the Shelf, table and bench looks like chipboard… 
Looks good
The reflection is really nice.
I like playing on and off with textures, but you’re right when something looks extra nice that it brings down the quality of other things. I try to write down the steps I use to make some textures so they will match up in method later.
But, hopefully, my friend will take care of most of the textures in a project we’re working on because I hate dealing with it! 
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You got a shot closer up to the instruments in the corner? That would be nice to see.
Not sure about the couch color though…
A dark leather might look better to me. Maybe with some wrinkles or aging marks.
Don’t forget the Disco Ball~

Oh, well. I love materials and textures. If you get stuck or find an interesting challenge, ping me 
Thanks, Jonas. I will let you know 
I don’t do too much with textures or materials within Blender other than mapping since the end result will be in Unreal Engine. I really just need to practice more in general with them.
That’s one reason I like to look at work like yours and the work of others. So thanks for sharing~