A brass lion door knocker marks the front door of the unassuming Main House run by Caroline Main. With just four floors and four rooms, it has a simple aim: to provide a good night's sleep in an interesting Victorian house. Furnished with animal hide rugs, antique furniture, Asian objets d'art, and huge beds, the rooms are uncluttered and delightfully spacious. Coffee or tea is brought to your room in the morning, and breakfast is made with organic ingredients. The tiny urban terrace is a great place for stargazing or reading the morning paper. The owner can arrange to have dinner brought to your room. A day rate at the local health club is available, and bicycles can be borrowed, too. www.themainhouse.com. 4 rooms. Fans, in-room VCRs, in-room data ports, massage, babysitting, dry cleaning, laundry service, Internet, meeting rooms, airport shuttle, parking (fee); no smoking. MC, V. Tube: Notting Hill Gate. Continental breakfast.