There are lots of centres in Yangon, I see a few have already been suggested, I'm just not sure any would be happy with you spending such a short time.
As would have been impressed on you at the Goenka courses you need at least 10 days to learn the technique properly, I suspect you need longer for Mahasi technique.
I strongly suggest you make available at least 1-2 weeks.
"Whenever we feel that we are definitely right, so much so that we refuse to open up to anything or anybody else, right there we are wrong. It becomes wrong view. When suffering arises, where does it arise from? The cause is wrong view, the fruit of that being suffering. If it was right view it wouldn't cause suffering." - Ajahn Chah
"Remember you dont meditate to get anything, but to get rid of things. We do it, not with desire, but with letting go. If you want anything, you wont find it." - Ajahn Chah