I haven’t drank many senchas, and those which I’ve drank were low quality ones, so I can’t compare it with something good.
I’ve steped this tea with 80ºC and 70ºC and 15-20sec steps (5gr).
The 80ºC ones were grassy, strong and a bit bitter (it was like that robustness with a hint of bitterness.
The ones at 70ºC became more gentle, grassy, no bitter, with a sweetness touch. Quite good.
Flavors: Grass, Sweet
As a standard, I use 10g of green tea, to 200 mL of water. The temperature will vary depending on the type of tea and how mellow a flavour that you want.
Cold brewing is also an option.