I've read numerous books and have listened to many podcasts.

@Kenneth LaVoie is an expert on building efficiency and has taken advantage of Efficiency Maine's numerous rebate programs to keep the winter out of his multifamily units.I personally have separated all the heating systems in my units, mostly with Rinnais, but you can get away with that in the Midcoast more so than other Maine towns where the expectation is that heat will be included in the rent.

I am a new investor and I have found numerous rentals in good condition, with long term renters already established (one in particular has had renters for 18 and 9 years), cash flowing anywhere from $400-$700 a month (including factoring in CapEx - 5%, anticipated repairs - 5%, property management - 10%, and a mortgage). 

I like the search features: https://www.biggerpockets.com/searchAlerts can be really helpful too: http://www.biggerpockets.com/alertsThere are a few self-contained guides that you can access here: https://www.biggerpockets.com/guides

I agree with Caleb on numerous fronts. 

Here are our top five favorite new features…Binding that lays flat—We heard your cries for help...

I have posted numerous topics on this website and asked many of questions.

I like the search features: https://www.biggerpockets.com/search

They all essentially do the same functions and charge for the same 'side features' like background screenings, rental estimates, legal documents. 

However, your question was what features inside the home drive demand.