The hotel marriott regent's park is a busy, vibrant hotel. It is an excellent hotel for families - both in terms of the costs and the available facilities. my ten year old son very much enjoyed the swimming pool.
breakfasts were very good,
... with a good selection.
the staff were extremely helpful and very courteous. I thought it was an excellent idea that there was dedicated staff member who could advise and on offer directions to tourist amenities. (in our case we needed to find out about sunday mass times in the local church and how to find it. )
it is extremely close to swiss cottage underground tube. the hotel is aslo extremely well served by buses.