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Fernandinho would add an insurance goalseven minutes from time with an excellent finish, as City booked their place at Wembley against Tottenham in April.
Stones, who has enjoyed a remarkable resurgence this season, said he is thriving after putting in plenty of hard work off the pitch.
"I'm just working hard, just trying to play as many games as possible," he told Sky Sports."I want to give everything to the team and stay true to myself - see what I can do, what I can improve on."
On his goal, he added:"I was just trying to follow the ball. They held a high line, just to get something on it was great.
"Playing these big games is something I thrive off and I just want to play well."
City turned in another strong performance as they continued their recent good form, with Wednesday their fifth consecutive win in all competitions.
Stones said the mentality instilled by manager Pep Guardiola is a big reason for their resurgence after a patchy start to the season.
"Pep Guardiola just said, 'Same again, same mentality, same everything,'" Stones said."We dealt with the problems well and just tried to be more clinical in the final third.
"We had so many chances, great chances, great moves to get into the box and we did a job at the end of the day."
Stones alsohighlightedthe death of City legend Colin Bell this week, with the club's former midfielder passing away at age 74.
"I'd like to send our condolences for Colin Bell and his family," Stones added.