We're going to London at the end of September for 2 nights with my husband and 2 kids (one an adult.) We'll be flying to Gatwick and will be going to the Harry Potter experience. Any recommendations for a hotel? We'll need 2 rooms for the 4 of us so would prefer something not too spendy (Premier Inn type budget) but that's in a good area for touristing. I don't know London at all so have no idea where to look. Thanks in advance.