We got it for a really good price of $360,000 on a super low interest rate (3%) back in '21.

So, I'll not even be in positive with the interest rate we get these days.

It's the best way to cash flow with current rates and prices.  

Medium to higher prices that cash-flow or break even (at current rates) are probably C/B- class.

Due to the high costs in San Diego and current interest rates, I would most likely only be able to put up to 10% down.

There's a lot of sharks out there that charge way more than what it should cost.Another strategy would be to go to areas that have much lower home cost, and good rental rates. 

There are some benefits for financing under an LLC (super fast refis, less paperwork, lots of loans), but also benefits for personal (30 yr fixed, low rates).  

I usually look through several places but one of the most consistent tools I've used to do a quick check on potential rental rates is Rentometer.

To be honest as an investor who owns dozens of units in several different markets I would tell you it's challenging to find great cashflow anywhere right now because we have both high prices and high rates.

With four operational STRs running out of it, the estimated cap rate will be 15-17%.