The cache is along busy streets, so keep the little ones close. Coords should get you really close. Keep your eyes pealed and you should find it in no time
Cache is located in an area with plenty of foot traffic, so watch those muggles! Might try this one either when the foot traffic goes down, or at night.
Update: This area of the sidewalk can be very busy with tour bus traffic. If there is too many people, give it a half hour our so and come back later