# where the banquet of wine had been

"where they had been drinking wine" or "where the banquet had been." They were probably also eating food, not only drinking wine.

# couch

a long piece of furniture where a person can sit or lie down

# Will he assault the queen in my presence in my own house?

"He even dares to attack the queen in my presence and in my own house!" 

# assault the queen

"attack the queen." This phrase is a polite way to refer to rape. 

# As soon as this sentence came out of the king's mouth

"As soon as the king said this" 

# the servants covered Haman's face

"the servants covered Haman's face as a sign that he would be killed"