I look at the tenant's financial situation (income security) as a very important part of the property analysis. 

I used furnished finder and keycheck to find tenants, screen them, and collect rent/security deposits. 

An estoppel certificate is a form you have the tenant sign that confirms their lease start date, the amount of their security deposit, and other things.

I have prospective tenants who signed a lease on 31st of October and paid security deposit same day.

This needs to be highlighted in the lease and acknowledged by them.Security Deposits: You can’t use their security deposit for routine cleaning, but if they leave things in bad shape beyond normal wear and tear, it’s fair game to deduct cleaning costs.I’d start by having a straightforward talk with them about the importance of keeping things clean for health reasons and property preservation.

Consider a cash-out refinance or a small business loan to fund these repairs and secure the property long-term.

In some states, particularly those with warmer climates and robust population growth, seasonality plays a less significant role.

CA has the AITD  and its a robust  debt instrument that is designed for these transactions.

Consider remote monitoring tools (like security cameras), and budget an extra 10-15% for surprises.

If your have tenants leave every 1-2 years and if it takes you a few months of lost rent to secure the next tenant what does that do to your numbers?