1) Will worker's councils act as a state or simply as a method of overthrowing capitalism?
Workers councils will exist in lieu of a state.
"Chief among the tenets of Council Communism is its opposition to the party vanguardism and democratic centralism of Leninist Ideologies and its contention that democratic workers' councils arising in the factories and municipalities are the natural form of working class organization and authority. Council Communism also stands in contrast to Social Democracy through its formal rejection of both the reformism and Parliamentarism."
2) Can one be an anarcho-communist and a council communist at the same time?
Both Anarcho-Communism and council communist exist within libertarian Socialism. They share the ideas of opposition to the collective control over the individual worker. Anarco-Communism and Council communism are not mutually exclusive.
3) What are your personal opinions on this ideology?
I think Anarcho-Communism is the only way of approaching and achieving communism. A state can not bring about a stateless society just as private ownership over the means of production cant create a society without Private ownership over the means of production. A socialist state is no better then a capitalist one for the workers for both subject the worker to unjust rule and exploitation.
"It is only by the abolition of the state, by the conquest of perfect liberty by the individual, by free agreement, association, and absolute free federation that we can reach Communism - the possession in common of our social inheritance, and the production in common of all riches." ~Peter Kropotkin
"Let us fight to free the world - to do away with national barriers - to do away with greed, with hate and intolerance. Let us fight for a world of reason, a world where science and progress will lead to all men’s happiness. Soldiers! in the name of democracy, let us all unite!" ~Charles Chaplin
"Communism is Anarchy. You can't regulate or reform your way to communism; it can only be achieved by direct action against state, class and capital."