I think there might be perspective issues with the lines along the ceiling, and top of the cupboard. According to the lines on the floor, the horizon seems ok, height-wise.
The problem with the couch I think, is mainly it's shadow, which makes it appear floating in front of the image. More well-defined shadows in sync with the direction of the light would look better. This also goes for the walls themselves, which all have the same brightness with a darker gradient towards the edges. It's unnatural, but in this image it sortof adds a dreamlike atmosphere.
Colorwise, the yellows are a bit aggressive.
Dropping the black outlines was a good idea.
Keep it up!