Babysitter wanted near Ópera, to begin in Sept.

Hi, all. My boyfriend and I are looking for an English-speaking baby-sitter for his 2 sweet daughters (aged 7 and 10), every other week beginning in September and continuing through the school year. You would pick them up from the bus stop at 17.00, walk to their activities and/or the flat (depending on the day of the week), and hang out with them (plus a small Boston terrier ????) until their dad returns from work. The flat is a 2-minute walk from Ópera and Santo Domingo Metro stations, and I can vouch for the loveliness of the entire family ? If you are interested, please send me a message telling me more about yourself and your experience. Thanks!