This is our first trip to London and we're having a hard time deciding. RS recommends both. WH is in Notting Hill area; AH in South Kensington. Price is comparable: WH is GBP130 incl. VAT and AH is GBP130 excl. VAT, so about $30 more. We'll be there the second week in December. Any experience with either? (Related question: Which neighborhood do you prefer as a home base?) (Aside: We tried for the Vicarage, but they were fully booked for our dates.)
We stayed at the Westland in March of 2008. We liked it OK. It seems a little high for what you get. I had trouble with the wifi. They do have an ice machine. The breakfast is good and will stay with you. We had a large room by London standards. It is across the street from Hyde Park. I run every morning and that is convenient. It is the area we like to home base in. We like walking, so to us it is convenient for most of what we do. We are going back this March, and we wish we were there again, but our deal is for the Chrysos close to Paddington. I don't think it will be as good, but we are just happy to be there. Good luck!