Hi Gayane,
Thanks for the link and the further information. You could go either way with this, but personally, I would stick with designating the business as brick-and-mortar. If you choose the settings for a service area business, Google will determine whether or not to hide your address, and if you are the only business in your locale/industry with a hidden address, there is some chance that you could see a ranking drop in Van Nuys. And, given your location (a busy, competitive place) setting a service radius is unlikely to cause you to show anyplace but Van Nuys, anyway. So, personally, I'd stick with the settings for brick-and-mortar because you are eligible, and I would pursue the work described in my point #2, above.
Hope this helps!