The third Zetter hotel had been open less than two weeks when we arrived toward the end of August 2015, but the 21-room boutique lodging had every detail perfected. As with the Hotel and Townhouse on the other side of London in Clerkenwell, the Marylebone Zetter looks unassuming from the outside, but you step through the front door into an ornate, over-the-top fantasyland of calculatedly matched and mismatched furnishings, memorabilia, decorations, knickknacks, and tchotchkes, all inspired by a fictional cad, Wicked Uncle Seymour, whose tastes, travels, and escapades allegedly yielded the dazzling arrays and displays throughout the Russell Sage-designed interiors. The heart of the townhouse is Seymour's Parlour, which is part lobby, part cocktail bar, and it's the latter that draws after-work tipplers from nearby Oxford Street, Edgware Road, and Mayfair. The menu of small plates and brilliant original cocktails, conceived by Bruno Loubet and The Drink Factory founder Tony Conigliaro, mitigate any need to leave the premises at night. For a lovely early morning excursion, Abbey Road Studios and the legendary Beatles crosswalk are a pleasant 25-minute walk away. Hyde Park is even closer.