I also renovated hallway and replaced all staircases with a new oak staircase.  

I would not expect to replace your W2 income in the first year and would project it to take 2-5 years before you were able to replace it, unless you are sitting on around 3-5M right now.

We replaced what we would have fixed if we were buying the house ourselves.

One of them hired a landscape guy, well, the landscape guy never came so I was paying $140 per month for nothing for about 7 months.The other property manager didn't tell the tenants they were responsible to replace the ac filter, that bill was $1000 to replace the AC fan motor.I am really afraid of blowing off the money.

I’d be very careful about who you replace this tenant with. 

Looking to maximize appreciation & tax benefits, so not necessarily looking for high cash flow to replace a salary.Good advice on not focusing on the number of properties.  

You have things like gutters and downspouts to worry about replacing. 

Your property is fairly destruction proof, costs near nothing to maintain, yet you can charge above market rents.If your property is nicer (class B) where the carpet alone might be $6k or more to replace when the tenant spills hair dye everywhere, you won't be as happy as in the situation above.  

For example we replaced a water heater recently.

Are you wanting to replace your job and do REI fulltime or just part time investing, or?