The Chestnuts is a classic English one-room B&B, run exceptionally well by the host Annetta. The accommodation is a reasonably spacious ground floor double room with ensuite, plus a small conservatory looking out onto the garden. TV and tea/coffee making facilities in the room. Breakfast is a varied continental (choice of cereals, toast, fruit, ham & cheese were on offer when I was there) plus tea/ground coffee, served at an agreed time.
My experience generally concords with other reviewers. Annetta is a charming and helpful host. Tourists and business visitors to London should also not overlook The Chestnuts, as it is a short walk to Hampton station, which is a ~40 minute train into Waterloo.