Hamanasha's Wedding will take place at Hotel Sahid, Surabaya. You can find it just across Hanamasa Restaurant (Yep, it's just across the restaurant that sounds just like our nickname). It also 5 minutes walk from Stasiun Gubeng. I believe you won't have any difficulty in finding this place. Nevertheless, here's some map information for you.
and more 3d images for your 'nerdy' needs