This is a fantastic place to gain some insight into the REI world, particularly for those starting out. 

I'm working with a client who's interested in a home that's currently used as an airbnb. 

Yes, it was the penalty I paid for not being firm and not knowing what do to...it seems like alteration request being used as way to get more refund is not new issue, and until Airbnb fixes this hosts have to be aware and plan for the course of action and stick with it.

Multifamily with a house and 11 rentals. 

They don't even bother taking phone calls any more from their clients. 

A great book to start with is "The Complete Guide to Buying and Selling Commercial Real Estate" by Steve Berges.

I plan to buy a house to househack this spring (either rent by the room or a house with an english basement).

with the market flat, contractors booked up, materials expensive and tremendous competition for deals it is very, very difficult for a new investor at this time.i've used hard money and also bought with cash and then financed the rehab.

in 12-18 months and do this again with larger multifamily.Details below.   

Go with an area that matches your lifestyle.2.