It is be difficult to answer in details on a post but I will give you some general info here as a guide:- The legal limit will depend on your location, layout of your house, and parking availability.

FULL STOP  Your ability to make such a profit will depend on your ability to manage the asset better than the prior owner.As a seller, the broker should be helping you determine the price point, at that time, that attracts enough buyers to achieve an optimal sales price.

If I would have known about these earlier I would have bought less personal real estate, but again it depends on your goals of leverage, building wealth, risk, and your overall perception on how to handle your money.      

In our experience you can get away with every 2-4 weeks depending on the weather and tenants. - Often, you can pay a tenant to do the cleaning.

It is a very block by block city depending on the neighborhood.  

Walls don't look bad at all overall but it depends on whether you have touch up paint that matches or not.

This depends.

The company offers promissory notes worth $50k, $100k, and $200k+, with annual interest rates ranging between 12% and 16.7% depending on the investment amount.

Quote from @Bryce Nesbitt: Sure, but you can't depend as a MF owner on everyone setting their car timer to match the building needs. 

It all depends on your appetite for risk.