Got it all done during 1 week in Bogotá and it all went very smoothly.
Interview was easy and experienced it more as a formality (make sure you put sufficient time and effort into your initial I-129F package. Remember: it is YOU that has the responsibility of showing enough proof of your bonafide relationship to the US government). It will all make you feel more confident during the waiting period and the day of the interview. Visa was approved in less than 20 minutes. I was able to pick up my passport with my K1 visa attached to it after 2 days at the embassy (yes, this was an exception and I am lucky). This enabled me to fly out of Colombia back home on the same day.