at the top/ like a Monopoly

"A house had been rented for them all to share at 49 Inverness Terrace, in Bayswater – a large terraced house that had been sequestered into different small apartments, where the five band members plus two roadies would live for the next eight months. It was crowded but ‘like the Taj Mahal’, says Evans, compared to Lansdowne Road. As usual, the brothers roomed together, as did Phil and Mark, while Bon was allowed his own small rooms 1.at the very top of the house. First though they ordered the limo to give them a tour of the London sights, driving past Buckingham Palace, Trafalgar Square, Piccadilly Circus . . . Malcolm remained typically underwhelmed, almost sneering, while2 Angus merely stared out the window and blew smoke against the glass"

1. What does the bolded mean? The second floor? The attic. There were 2 floors if it is a terraced house?
2. So stare out means that he was looking through a window, without putting his head outside? and was smokin insided? I though stare out of the window implies the head being outside the room,

3.The others though gawped in genuine awe. ‘Like looking at a Monopoly board’ . Is the bolded an idiom? What does it mean?