Shown this one quite a few times but, here it is again. It is not a 2 story, but the plot size is similar.
Ground floor
2nd floor
3rd floor
Roof
You probably remember this one in Zento on Siege, Falon. I made it for Mac of KSS a long time ago, and per his request, it was designed to withstand the PvP attacks he always seemed to be a magnet for being the knightly type, while still being aesthetic. He also wanted maximum free space. So, as such, it was a decorative "box" like many of my houses. Castor helped me test it, in terms of fields/summons attacks, and it was pretty secure for such a small house.
The teleporters sequence was designed so you could quickly get to every floor in a circuit, and back down to the ground floor again (I hate complicated teleporter schemes!), so if someone was after you, when you reached the plot you were transported inside on the ground floor if you hit the left pad on the poch or onto the roof if the right. We tested the roof pretty extensively, and could not reach anyone with spells or summons up there. The ground floor interior was safe from field spells if you stayed in the middle of the room.
If you don't mind a death trap, you can make an adorable little "cottage" with forge, etc. I saw one with one of the heritage ladders, and an apple tree, it was so cute. There were a couple of small house threads here that gave such examples.
-Skylark