Whichever option you start with, SFR, duplex, renting out rooms .. an option to think about for a good tenant rent source is AIRBNB.com  If you've never heard of the service, long story short, people rent out rooms to guests from all over the world. 

This is one of my favorite features of Bigger Pockets especially for asking specific questions.

They can use the rubbish bin.Everything they complain about, remove the source of the complaint as much as you can without breaching the lease with them.Appeasement as a strategy never works - not in world diplomacy and not with tenants like yours. 

You are probably thinking because the price of oil; that i'm looking for new source of income but, I am actually making more money than I ever have since I started.

I source and sell properties both residentials and commercial.

You are right that you have to know what you're looking at in comps because two identical row homes can have or lack features that make a huge difference to the user's quality of life.

The program will have clear standards, consistent documentation, solid accounting and other features which we believe are significantly different from the way other turn-key properties are usually offered.If you will send me an email with your basic criteria, I will reply with the outline of this program.

His book, Real Estate Finance and Investments: Risks and Opportunities, (now in its 3rd Edition) has been adopted at over 70 leading universities, and is the leading primary reference source in real estate finance and investment.

This is one of my favorite features of Bigger Pockets especially for asking specific questions.

I can buy a 16x50 front porch model with upgraded features, including insulation, for about 18 K delivered and set it for about 2k, bringing my cost to around 20K.