Great communication for checkin and last minute details. We stored luggage at the front desk, as another group was checking out as we arrived. Great location, in fine shape. A/C was excellent! Downstairs kitchen has great appliances, but very low on pots, pans, cutlery, glasses, etc. The 6 of us are over 60, so had to be careful taking luggage down the steep stairs. All the bathrooms functioned well, with plenty of hot water! The washer and dryer (amazing to have in Europe!) worked very well. Odd that there is no bathroom or even water faucet somewhere on the ground floor, as the king bedroom is probably the best, just tough for old folks that get up by necessity at night, as gotta negotiate the stairs to the half-bath. Would be nice to have a laminated sheet in the main area with the passwords to the upstairs and downstairs wifi. Neighborhood was very quiet, but could hear a slight rumble of the tube, like most places in London. Couple of pubs are really close, as is a great pastry/coffee shop. The Mayfair location makes getting to the Tube (two stations are close), Hyde or St James Parks, etc. very easy. Taxis and Uber are quick to respond in the area. I would highly recommend the flat to a group visiting London! One note, there is also a 42 Hertford Road which is about 30 minutes away, so be sure you put in the right address: 42 Hertford Street!