Usually I drink tea by myself so for one person would be totaly ok, I am very fond of my gaiwans, all around 100 ml and are perfect size. I have kyusu about 200 ml and I can say it is too big, I always do my tea with half the water so I guess shiboridashi or houhin that big would be too big for my use. Perhaps 150 ml maximum.
I'm still not totaly sure if I will get shiboridashi or houhin. I guess filter is a plus. Maybe if you have any ideas or suggestions on houhin would be grat.
And thanks all to participate and sharing your thoughts