I've noticed when setting a location with a full address in the calendar app as long as it is prefixed with a number, the address turns red and you can tap the address and IOS 7 opens to maps straight from the event. However if there is no number prefix in the address the details stay black and maps will not open from the event. So for example if the address is on a industrial or trading park e.g. The Trading Park, Grosvenor Road, London, W4K 7AP it does not become a highlighted usable link, but, The Trading Park, 21 Grosvenor Road, London, W4K 7AP does and when pressed will open directly to maps. I'm not sure if this is the same in IOS 6 or if this feature will be improved to open any address with or without a number prefix, which I hope it does because it seems very useful.