Add custom fields

@prehn,
phone number is currently present in my map location.
for adding mail address you can have contact link and in that you can write mailto:mail.com so it will auytomotically mail as well.
Import function work good for lot of clients so i think it will gonna work for you as well.
still if you facing any issue please drop us ticket so we will help you to fix the issues.

Sounds great, how about zip code, city,and street address, are they in separate fields?

Yes they are seperate feilds.
please look at screenshot of fields in backend.