Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Most homeowners policies have guidelines on the # of renters and other things related.

what should be a reason to choose 1 market over the other how to identify a market to buy?

It's time deploy $$$ into other opportunities including the one with your partner.The cash-flow would have to be crazy to hold it and that's if you don't need the money, but it sounds like you do for the next investment.

Over the course of the year I raised the other 3 units as their leases expired.

I highly recommend attending a few local meetups and get to know other local investors.

My other units continue to do very well with steady rate increases over the last few years. 

Karen, I've talked to hundreds of investors about their experiences on both of those platforms, as well as many others.

I know Austin; I don't know other markets.

Here's an interesting thread where I shared more and others did too it can be really helpful about wholesaling basics:https://www.biggerpockets.com/forums/93/topics/1195986-is-wh...