SA is a good opportunity for foreigners to experience japanese culture from inside, try go off your limits to communicate with other tenants in Japanese as mmuch as you can, even it is not perfect, you'll make mistakes, but you efforts will be rewarded by the community. SA community is large, you will be able to make various friends, sharing activities inside and ouside the building (games, outdoor activities, restaurant, party, etc). Compare to other sharehouse, here rules a fair and sustainable (ie. no fridge war).
Even if the rooms are a bit small, the idea of Social Apartment is that you won't stay much in your room, you will go to the shared areas and make friends. The shared areas are very comfortable and stylish. If you have free time to enjoy the shared areas and socialize, Social Apartment is a great place for that.