Will the base plate of this Foalom Baby Bassinets be very hard?
No, it will not be hard, it has a soft and comfortable mattress.
How tall is this Baby Bassinets? Can you adjust it to match the height of the bed?
It has three adjustable height settings, with the highest being 19.3 inches and the lowest being 17.7 inches, suitable for matching the height of any bed or sofa.
Will this Baby Bassinets make a loud noise when shaking or pushing it to wake up a sleeping baby?
It will not make any noise, it is quiet.