This is a nice apartment on ground level (no lugging your suitcases up staircases) and is super-convenient, being a 7 minute walk from Paddington Station / the Heathrow Express. It's also a few minutes away from the Underground, meaning that you have easy access to the heart of London.
The apartment itself is quite nice, with a fully-furnished kitchen and very nice bathroom. The bedroom, while a touch on the small side, is cozy and very nicely decorated. The furniture is pleasantly contemporary and lend a laid-back atmosphere to the place.
The only downside is the heat and lack of ventilation. While the AirBnB summary does mention ahead of time that the patio doors/windows can't be opened, it would be great if the owners converted those doors and windows to actually open, letting in a much-needed breeze.
They thoughtfully provided several fans around the place, but those didn't nearly dispel the heat from the unit. They need to either add opening windows, or to install an air conditioning unit. It was too hot for the fans in September; I can only imagine how hot it gets in the apartment in the middle of summer.
Nonetheless, this is a cozy, well-furnished, and excellently-located apartment that will be a great jumping-off point for your London travels.