My family and I, including girlfriends of our older boys, spent 10 days in this apartment. There were seven of us in all, and it was an excellent base-station for our adventures. The photos in the description makes it hard to see, but the majority of the flat is actually on one-level, with only one bedroom a floor above that level. This makes it very easy to hang out as a group--the kitchen is across from the living area and next to three of the four bedrooms. It's true that one bedroom has no window and was definitely the least favorite among our crew but it worked out fine--bedrooms are for sleeping in! The kitchen was fully functional and we could both cook and eat meals there. The living area was nearby and served as another hang for the younger set. The apartment has no air conditioning, but I can tell you that's not a problem as one day on our trip was 98F (I think 38C) and the way the apartment allows for cross ventilation it cooled down at night to the point were it felt fine. And the numerous windows also made for great views of the quaint brick buildings and clay chimneys of the surrounding area.
But the best feature of this apartment is the location of this apartment. The area directly below it has fantastic eating and drinking options. There are two grocery stores a block away. Fitzrovia, Soho, Marleybone-it's right in the middle of the best London neighborhoods and a short walk to Regents Park, Trafalger Square, Leicester Square, Oxford Circus and so many more iconic London sites. It's also just a block to the Goodge Station on the Northern Line for attractions you don't want to walk to.
I highly recommend this apartment and I hope I can return to it on some future trip.