You will certainly come across several groups in the Austin area...but none will only specialize in Section 8. 

I specialize in home remodeling. 

I just joined im an insurance agent and specialize in the homebuying industry! 

@Leslie Cunningham this is such a specific niche that it might be hard to find someone that specializes in it. 

And there are so many small carveouts for special interests in IRS interpretations.

I specialize in STR'S Feel free to connect and I can cover in more detail. 

If you are a Real Estate Professional this cap does not apply and hence why it is such a powerful status for tax planning.As @John Underwood said, Schedule C income categorized by "substantial services" such as turn down services, meals prepared, or special activities provided.

Do they tend to have any special issues with vacancies, or more maintenance due to the type of renters?

Pick an area that you want to specialize in, and then work on it hard! 

Thanks for all the comments, specially about the tax exemption (that was not on my radar!).