Just paint and carpet is $6000-$7000 on a small home. 

Then i painted the whole house and refinished the kitchen cupboards.

At the minimum, the home needs to be freshly painted, newer flooring, and all the appliances in good working condition. 

I also redid all the plumbing, electrical, and painted the entire place.

You'll want to saturate that subfloor with some enzymatic cleaner and possibly some odor blocking paint thereafter if it smells really bad. 

sometimes though the ones who are the most experienced and think they know it all are the hardest ones to work with they are too busy to really take the time their buyers need to help through the build process.. so its hard to paint a brush over every agent..

Hi Tijana,Be aware of the Lead Paint laws in MA, they're very strict.

@Ezra Nugroho all 3 were clean and paint. 2 had new gas furnaces from last owner, 1 had central air. all 3 had off street parking. 

They will tell callers that "their cousin" is at the house painting.

If you're planning on building an ADU or JADU 'yourself', my suggestion is to make sure you have some previous knowledge of construction and also make sure you know good sub-contractors in the following trades:  electrical, plumbing, foundation, roofing, framing, drywall/paint, stucco, tile, cabinetry, flooring, HVAC, concrete, etc.The last thing you want is poor quality work that has to be re-done because a handyman or the wrong tradesman did the work.