Agreed with the common theme here on leaving one unit vacant. 

The theme parks are packed all the time lol. 

The ones the bought larger home that either were well themed out or they invested themselves to do that, have reported to me that they are still doing well.

Theming is a must.

Themed Property Potential:In Kissimmee's resort communities, themed properties are a game-changer.

I'd warn you of a common theme I hear - people finding super cheap lots in distressed areas and wanting to build new there, because the lots are so cheap.

Pick a theme for the home, stick to it, and don't overpay!

No angry customers to worry about, but yeah the pet care theme is what I was not sure about.

A common theme I've picked up on for Section 8 is to make the property a little more sexy than usual, some tenants with vouchers have never had granite looking counter tops or stainless steel appliances and would love to stay there long term now that they have had it.

When you own multi-unit properties the 5th grade math goes like this.You purchase a 4-unit property for whatever price you pay and each unit gives you a $150 per month cash flowSo, now how do you get filthy with with 4 units vs a stinky single family home that sucks you dry.You earn 4 x $150 per month = $600 per month = $7200 per year positive cash flow you can put in your pocket and spend it going to Disneyland one time as $150 per ticket to get into one theme park where I think a small popcorn is now $7.Apartment units are in high demand and the Gross Multiplier is an average number being used today.You raise the rents for each unit only $50 the day you close escrow and you just made more money that most people can bank in 1 or 2 years and the math goes like this.4 units X $50 - $200 per month more positive cashflow x 12 month = a lousy $2400 per year.Now, your positive cashflow is $7200 + $2400 = $96,00 per year.