HOTEL
DescriptionThe hotel is situated right in the centre of London in Portland Place, a few minutes walk from Oxford Street and Regent Street offering some of the best shopping in London. The nearest underground station is Oxford Circus. It has got five stars.PRIZE: 619 €

You can alsow go: http://www.es.lastminute.com/hotels/reserveHotelAction.do --> for the hotel. This hotel cost 90 euros aprox.
If you want to the trip would be cheaper, in the airport you can call one friend and he/she can take you and leave you in your home.For train or bus...you can ask in Londres for timetable.