I kinda play by ear; not that great tho. I wish I could. I play a lot better by sight. My teacher says I"m better than her at sight reading. So I guess that's a good thing. xD
I use any RCM repertoire book that's around my grade level, or any sheet music that I can get off the internet for free xD
I only have a smallish parlour piano.

I love any soundtrack piece, especially Doctor Who. "Vale Decem" and "I am the Doctor" are my favourites. Although it's hard to play Vale Decem without crying...
I really love slow minor pieces. Maybe it's because I'm a slow minor person. xD
I like C (obviously), F, and B flat. And all minor keys except for F sharp

I'm kinda good... not as good as I should be for playing for 13+ years.
YES. IMPROV IS LIFE.
It's kinda in the middle of easy and hard. But closer to easier.
Hahaha! I started reading this and I was like "woah.... he must have a big thing for pianos..." xD