A flat roof would be nice, but for example also "modern Barn"
I always struggle a bit with myself on this:
a) bring a concrete idea as precise as possible
or
b) "Hello architect, here is the plot, a house for two, please make something, then we talk :)"
Now I hear that there are some arguments for "b"
No, a AND b, exactly in that order. First, you have to come to terms with yourself, because you will only be able to connect flat roof and modern Barn with "or" – otherwise it will be a "house for two" in the sense of "two architects," meaning you have to go to the architectural office Jekyll & Hyde :-)