For example, I am a little concerned about some aspects of the business cycle recovery and a potential for a double-dip so I lean toward the safest part of capital stack which is debt (or low-debt equity).

It sounds like you’re in a great position to get started—$100k saved up and a clear goal are huge advantages.

I agree about a strong correlation between a good credit score and a good tenant.

I would find a property that can provide you both.I used to aim for 8% cash on cash return + 4% appreciationGiven where the market is now, it is likely hard to find 8% cash-on cash and a 4% appreciation.I think 4% cash-on cash and 4% appreciation is do-able.

As both a realtor and a general contractor.

It ensures they did a good job and a thorough job, it also provides evidence of the state the house was in when guests arrived in case there are any guest complaints or guest damage.

Here's info on screening tenants here from BP - and a link to a screening partner.BP's Tenant Screening - Ultimate GuideGood luck.

My original SFR was 1100sf and I added 2 units: an 800sf SB9 unit and a 750sf ADU (converted garage plus addition).

I sat in on a lot of the meetings with owners/city and it seems for the most part to me, the city is just not interesting in AirBnB and as an investor, that's not a good place to be or be right.There will always be probably a few people who skirt the law or think they have a good workaround, but often catch 22. 

My STR had 15 Mbps, and I could stream Netflix on four TVs and a mobile device without any lag.