First the pics are very accurate. In fact, everything Lisa mentioned is accurate.
The place is very clean. Close to many bus stops, walk to King's Cross, and therefore London and everyplace very much at your reach. The flat is warm, modern and luxurious. Fully equipped kitchen with big enough fridge washer and dryer. The best part is that every amenities were included: towels, soap/conditioner/shampoo, sponges, detergent, etc etc. Rooms have plenty of closet space and roomy with blow dryers! Even the power adaptors were included and the best are those USB plugs ! Big Size Tv with Netflix plenty of sitting space. Very comfortable for 7 people (we travelled with children but could have been perfect for 3 couples + single). We travelled during peak heat days and there were fans in every room which made it more bearable.
Internet was weak but we were given a solution. And YES you do feel the tube line under you (accurate right), but really you get use to it hopefully will be too tired after exploring the city for it to bother you. Lisa wasn't on the premises but she gave perfect instructions and answered fast when needed. There are lots of stairs but probably not atypical for London.
Would book again and recommend to friends.