Doubletree hotels in London

I know that this has been mentioned in the sub in the past, but I did want to ask again. We are a family of three with an autistic teenager, and we are currently considering either the Doubletree in Kensington (Definitely more affordable) or the doubletree in Victoria (almost double the price). I'm not against paying more, but was hoping to get some insight on this level of hilton property in London. We want to take the train a lot, but also want a quiet neighborhood to be able to retire to. Let me know your thoughts. Thanks!