This is good block killer.
Of course there is much room for improvement but don't let what others say discourage you. They are just used to seeing great builds.
I would rate this a 5/10 because for one, you didn't use a million 1x1's for the walls.
Also your stair well has a banister. Not many people remember to add that, it will surprise you.
Keep up the work, I hope to see improvement on your next design.