Thanks. Other than the aeropress filter, I'll try your method and see how it goes. Maybe I leave the heat too high too.

Edit: just tried it this morning. I left the base on the heater at low-med heat, poured boiling water in it before putting the coffee holder thing and screwing the top on.

Left it on the stove on medium until it started to pour into the top then reduced the heat a little. Then when it was just bubbling I took it off and poured in my cup.

It's an improvement, but it's still a bit bitter.

I enjoy a good espresso from time to time, but I think my preference is really the French press which gives a much smoother brew in my opinion. Especially with lighter roasts.