We called them and set up the appointment - some tips are:
stay at the courtyard marriott which is right next door.
Get a driver to take you to and from the airport.
After your appointment find a resort and stay on it, we stayed at Grande Bahia which was all inclusive. They have quite a few of them in the Dominican, very good value for money , great food and clean.
Do not drive around after 6pm!! ( we were stopped by the police and they took our drivers license - had to pay to get it back, this happens a lot!!)
The Embassy accepts visa cards so there is no need to carry cash in there.
Go to the bank for the visa receipts a day before your appointment - if you can not speak spanish try and take an interpreter, my husband went in the bank at 10am and got out around 1.30, it was a very stressy task!
If you are crazy enough to drive, take out tire insurance and collision insurance - when you get into Santo Domingo you will see what i mean.
beware of the speed humps on the road as the will burst your tire
After you appointment stay on a resort, did i already say that? hmmm must be important then, remember this is a 3rd world country which is right next to Haiti which is a 4th world country...
as long as you stay on the resort you will be ok x