First of all, the house should be square and not short of corners. However, there are few square houses now, so try not to choose houses with too many missing corners.
Are there any shapes around the house? If there are any bad shapes, you should pay attention.
It would be better if we knew the previous purpose of the upstairs area. If it was a cemetery or something, you wouldn't choose it.
It also depends on whether there are related pillars around the house, and it is best to rely on them.
Finally, we should also consider the layout of the house after renovation.
If the house is suitable for the future layout, it is a good house.