The only certainty you can ever have with any financial market is that it will fluctuate. 

People were using boutique property management companies that charged 40-50% of revenue, and then turning around and charging guests crazy high nightly prices that never fluctuate, so the property normally only had 40-50% occupancy in the winter and less in the summer.We realized this was a dumb and outdated system, put our unit on airbnb and self-managed, actively changed nightly prices based on demand, and made a few other important tweaks to the system.

I have no clue how Guyana's currency fluctuates so I can't help there.

I know some people are cashing out since the market is hot, however I view real estate as a buy & hold stock- it’s going to fluctuate and go up and down, but as long as I’m getting paid it’s a sound investment.

Kyle, place in some numbers of a house you were looking at, price, mortgage,taxes etc. average rent for the area for same size units. may be a little easier to get answers from people if they can help check your figures. i know in the area that i am investing right now, a 4 bedroom unit runs me $200 / bedroom/ month to run and i have a 2 family with 8 bedrooms that runs me $150- the more bedrooms the less per bedroom. that is without the mortgage. that can fluctuate depending on the cost of the property and the amount you put down, so i leave that number separate. to me Maintenance seems a little high, if you have a unit that collects $1700 per month ( 20,400 yr ) at 15% that's $3060 for lawn care and snow removal. i pay half that $1500 - so that's 7 1/2 percent ( these numbers come from my 4 bedroom unit ( 1700 & 1500 )). that would be another 1500 in your pocket. what you can do is ask a management co. in the area what is the typical charge for maintenance, or a local landscaper. that 1500 could make a difference in your numbers, and there may be others. show a sample and you may get some insight from others

I'm using a combination of : - Zillow estimates : these seem to fluctuate quite a bit, so not sure how much to trust the "ZEstimate"- Craigslist : just look for postings in the area and use photos to get an estimate- Rentometer : usually seem to be pretty good, but does seem to lag a bit Any other good tools you guys have found ?

So is a good deal one that provides a buffer from market fluctuations?

Also, that number fluctuates each week, bouncing around the 2's for over a year.  

Even if the market fluctuates, I am safe with my original financing terms.

A few comments on what you had to say;- HELOCs have a fluctuating rate, unless you lock yourself to a constant rate, which is generally more expensive, and even then usually 5 years or so.