I may be working as an Au pair in London,need advice.?

Hi. applied for a job as an Au pair a couple of days ago,and the lady i wrote to wrote back saying she wants me to send her a photo of myself and chat with her on the phone for our interview,as i dont have a webcam,we could have done the interview over the internet,The reason for this is because the job is in London,and i dont live near there.She said i sounded lovely.Do you think it sounds like i may get the job ?.I have never worked as an au pair before,but i do have a kind and pleasant nature,and i love children.I also love London,although i've only ever been there with my family for weekend breaks,i've never been there alone or for a long amount of time.I would live in with the family too.I've never lived away from my family before,but i think it would be a great experience,although of course,i would also need to be wary.I'm in my early twenties by the way.I would also be leaving my boyfriend,which i'm worried about,he might not be happy with me going,and i dont know if they would let him come along,especially as he wouldnt be working down there.I would be there inbetween 4 months and a year.What do you think about this ?