CAGR is a geometric average return on your equity. So if you make 10% the first year on $1 of equity (so 1.1x your money), you need to make 10% off the 1.1x starting point (so 1.1*1.1 = 1.21x) to maintain a 10% average CAGR across the two years.
In your example, if the $800 per month is after interest, then you made a 38% return (CAGR) for that year ($800*12/$25,000). It's a -14% return if that $800 is before interest ($375k debt * 3% = $13,125 in interest expenses). In both cases I'm using $25k (your equity) as the denominator.
Assuming you meant after-interest, the returns look great but well fall as you do scheduled debt paydown (so your equity, the denominator, grows). Also cash returns tend to overstate the real return because not all depreciation is "paper"; depreciation is supposed to (and to some extent does) proxy that the property gets worn-out after a while and you'll need to spend additional money at some point on capital improvements to keep it in shape to be rented-out.
Also how are you only putting 6.7% equity down? FHA loan?