You'll have quality tenants, minimal hands-on management, and lower potential maintenance issues.

If you put landlording next to exercising, exercising might be more passive as an activity.

Anything over that could mean that the property is overstaffed, or it could mean that management is delivering a very high level of service such as in a luxury property that has a doorman and all sorts of staff that you don't typically see in garden style apartments.

This attracts a higher-quality renter, ensures funds are available to maintain the home, and reduces the risk of major losses.

They typically have multiple origination points (meaning very high closing costs) very high rates (compared to conventional but also compared to 6 month or longer waiting period DSCR products) and almost always have VERY long pre-payment periods up to 5 years.

Are their listings detailed with good quality photos?

Turn key investments are at such a high negative cash flow that I don't think it'll be a viable option. 

Find one that can be custom to your needs, has flexible pricing, no long-term, high-cost memberships, and excellent customer services to determine how to best market to your leads.

If he starts now he can buy his own car for high school.  

Because high rental yields, tax free income, and stable market. what do I have to learn first to start investing on Dubai's rental properties?