1: Soil Drainage, standing water 2. Protection from Wind\Driving Rains 3. Accessibility
The lot seems small from the picture; be mindful of your neighbors and the potential noise the chickens will make. Try to avoid putting it too close to a neighboring house - particularly bedrooms - so everyone stays happy. Other things such as drainage don't have to be a deal-breaker if you are willing to get to work fixing soil issues or digging in drainage channels. Since your plot is windy, you'll need to find out which directions are most prevalent and plan accordingly - particularly for keeping the coop dry when it is raining horizontally. Also, coop construction in windy conditions... make sure to use sturdy materials and check for damage regularly, particularly to the run, if you have one.
Sometimes I wonder how our house is still standing with the kind of winds we get where I am.