As for the furnishings, one of the options I provide landlords with, is to keep the purchased furniture after the trial period, and offer the unit as a furnished rental to the next tenant.

He came back 1/2 hour later with a tape measure and started to figure out how he was going to fit is furniture in the rooms.

Rotten food in the fridge dried dog poop and fleas .all furniture ect ..

The worst is when you have say a room door colliding with the closet door or a closet not usable because the door can't open without banging into furniture. 

It sounds very profitable and the market sounds very good for mobile homes in the area he is concentrating on,Flipping furniture?  

Those appraisers love to kill sales.Here's some sound advice that will prevent you (and anyone else reading this) from buying a new car/furniture/vacation with your pretend profits before close of escrow; The deal ain't done until the check clears the bank.

It has furnitures because I used to have a close friend live there.

But if you still want an increase in rent, throw in some furniture and you can definitely increase the rent, only if there is any demand of furnished units.  

Overgrown yards, cars and tires in yards, backyards with furniture and trash. 

Also look at things that may be detractors, like the neighborhood, or awkward layout, or tight hallways that will make moving furniture difficult, etc.