Couch for weird corner

Hi guys,

My girlfriend and I just moved in our first apartment together. All the furniture is from our old apartments. My old couch is a little to small, so we thought about getting an L-shaped couch, but we are not sure if it fits or makes the room or the corner feel weird. The windows wall has a slight slope (hope that's the correct word haha), but not all the way. Any suggestions? Thanks in advance 🙂