I have 2 duplexes in class C neighborhoods and it is harder than I thought to get them rented out (currently I have 2 units vacant, 1 is occupied and I am househacking the other). 

If you have a good unit, you shouldn't have much of a problem renting it in today's rental environment.

If you try to pick a market first, then you have to do research to figure out what investment approach and asset class work in that market, which can be more difficult than the first approach.As a rule I would avoid Waterbury, not saying investors aren't doing well there but it's better to stay out of that market.

(d) Prior to a sale, the landlord shall make reasonable efforts to notify the tenant of the sale at least 14 days prior to the sale, by personal service in writing or sending written notification of the sale by first class and certified mail to the tenant's last known address or usual place of abode, if known by the landlord, and by posting notice of the sale in a conspicuous place on the premises at least two weeks prior to the sale.

We've been using Quickbooks so that's what I recommend, either the QBO Plus (with Class feature) or the QB Desktop.

I also suggest before you sign a new lease that you read the CA  LL/tenant law and sign up for your local rental owners association so you can take classes and get some solid education. 

Understand A/B/C class neighborhoods and what we want to invest inCheck safety/crime, schools, Check population driversCheck population growthCheck income growthCheck if the state is landlord friendly or tenant friendlyCheck regulations within each stateCheck if the properties fit the 1% rule and run analysis on numbersNarrow to 2-3 markets.

The numbers just need to work so we are cash flow positive.Here is what we are OK with:Light reno workB/C class neighborhoodsAnywhere in the state

Looking for stable or growing population, varied work industry (not just one main industry), B/C class areas, 1% rule (min 6% cap rate).  

First off, anyone who has ever taken a statistics class knows how easily you can get the answer you want by cherry picking and assigning weights to select data.