Side by side Belmond The Cadogan vs Four Seasons Hotel London at Tower Bridge

This is a 54-room converted Chelsea townhouse where the staff learn your name by the first evening and then do something with it: scarves left in the room before an Arsenal match, a cake for a birthday, a teddy bear tucked into a child's bed the night before a wedding. That's the case for booking it over almost anything else in this part of London. The concierge desk is the best reason to stay, repeatedly credited with landing reservations and tours that would otherwise take weeks of planning.

The rooms are the catch, and it's worth saying plainly: entry-level categories run small, smaller than the website photos suggest, and at least one guest got hit with a full bill after a heating fault that took two nights to fix. Book a junior suite or above if the room itself matters to you, because the base category is the one place this hotel undersells its own price. There's also no real wellness offering, the gym has gone unavailable mid-stay, so this isn't the pick if a workout or a spa afternoon is part of the trip.

None of that undoes what the place actually is: a small, quiet, almost residential hotel with its own private garden across the street, antique books in the rooms, and a kitchen that handled a child's allergy without being asked twice. People who've tried the grander Knightsbridge houses keep landing here anyway for the scale and the warmth. Book it for the townhouse feel and the people running it, not for the square footage.

This is the former Port of London Authority building turned Four Seasons, and the scale of that conversion is most of the case: five-metre ceilings, hand-carved plasterwork, suites that run to 70 square metres with gas fireplaces and freestanding tubs. Base rooms face an internal courtyard rather than the Thames, but the trade-off is quiet, genuinely quiet, in a way few central London hotels manage. The building alone is worth the detour east.

The catch is location and food, and both are price-conditional rather than dealbreakers. Tower Bridge and the Tower of London are on the doorstep, and the tube is a minute away, but Mayfair and the West End are a 30-minute Uber, which matters if that's why you're in London. Afternoon tea is the recurring sore point: guests report 45-minute waits, cold scones, savoury portions that don't match the sweet course, and a kitchen unwilling to comp a top-up on a five-star bill. Breakfast is similarly hit-or-miss for a hotel at this level, while the Rotunda Bar's cocktails get named and praised repeatedly, with Trey behind the bar coming up on his own merits.

The spa is a genuine draw, an 18,000-square-foot basement space with a proper sauna and steam room, best visited early morning before the pool fills with children (there's a no-kids-after-11am window that regulars plan around). Book this for the room, the quiet, and a hotel that resolved a broken air conditioner at midnight by moving a guest into a better suite without fuss. Skip the tea, and if Mayfair proximity matters more than square footage, that's a fair reason to look elsewhere.