1st time visitor to London

The Marriott at County Hall is right next to the London Eye and across the bridge from Big Ben: http://tinyurl.com/5sddlgk

We stayed at the Marriott Grosvenor Square in Mayfair on points as well. Very superb location: close to tube, theaters, shopping, lots of restaurants, and the major sightseeing areas.

I second the recommendation of the Marriott at County Hall - can't get a much more central location than that.

Marriott London Kensington is a great location, few minutes walk to Gloucester Tube station and Earls Court tube station.

This month an old landmark returns. The wonderful Midland Grand Hotel is back as the St Pancras Renaissance London. I'll grant you that walking from there to tourist sites is not easily possible but with the Bank Branch of the Northern Line, the Piccadilly Line, the Circle Line, the Hammersmith and City Line, the Metropolitan Line, the Victoria Line and Capitol Connect just downstairs and 15 bus lines just outside you can get absolutely anywhere very quickly and with no connections, including anywhere in London and because it goes straight into the station you can go to Paris without putting on a coat. As it hasn't opened yet we can't say what it is like but I bet it will be good. I normally don't copy advertising bumf but in this case I really think it speaks very well about the building: A Victorian masterpiece restored...Sir John Betjeman called this Gothic treasure "too beautiful and too romantic to survive" in a world of tower blocks and concrete. After years of devoted restoration, the St Pancras Renaissance London Hotel is being hailed as the city's most romantic building. This London 5-star hotel features glorious Gothic Revival metalwork, gold leaf ceilings, hand-stenciled wall designs - and the grand staircase are as dazzling as the day Queen Victoria opened the hotel in 1873. Designed by Sir George Gilbert Scott to receive travellers through St Pancras Station, the former Midland Grand Hotel offered its guests a world of grandeur, luxury and fantasy behind its fairytale red facade. Innovations such as ascending rooms (elevators) and revolving doors heightened the sense of awe. In 2011, the doors of his luxury hotel in London will be spinning again, sweeping guests into a world where modern amenities mingle with the extravagance of rail's golden age.
Not cheap though - level 7 points

The Royal Suite is 10,000 pounds a night!!!

The Royals can afford it.