You're welcome! Our case was sent to London actually! My fiance is British, we just met in Madrid! I'm not sure if the process is the same for every embassy but when our case was forwarded from NVC, we did the DS160 and booked the medical! I think you should definitely be able to fill out the DS160 now but maybe check with others filing in Spain first!
Last update: he received his passport and packet!!! 😍 Flight is booked for April 17th!!!