There is a dance floor in the Havana Bar but I think you may be disappointed with the size. We also love dancing and the dance facilities were our only disappointment on our day visit. Sorry if thats not what you wanted to hear but there is some space.
Yes the Havanna Bar has a dance floor and does focus on Latin american. The main dance area is in the Tamarind Club but the dance floor itself is quite small and prone to get overcrowded.
Havng seen the havana bar it is not that big but done out nicely during the day and in the evening they normally play music from groups like pink martini. I think you might find it a bit tight but the atomsphere should be great.