Already planned a trip to London and Paris for the coming holiday? In case you’ve already been-there-done-that, you might want to consult the GoGo City Guides (www.gogocityguides.com) which recommend where to see the best art, eat at hip places, and shop for interesting finds. It’s actually not very new, first launched as a biannual guidebook for Paris in 2010, but its success has brought regular updates, as well as another guide for London. More importantly, they have recently introduced an affordable iPhone app (€2.99/US$4.99/B130), with the same information plus offline maps—so you don’t have to worry about roaming charges.