This apartment could not be better located for anyone wanting to explore London with ease. Even as a family of five with three young children, we were able to walk just about everywhere - Westminster, the West End, Borough, Tower Bridge and the city. It's also very close to Waterloo and not far from London Bridge, both connection points for day trips outside London. A small supermarket across the road means it's hugely convenient for grabbing anything you need last minute and it's surrounded by great places to eat and drink.
The apartment itself is spread across four floors (five if you include the ground floor entry) and the stairs connecting them are narrow and relatively steep. This wasn't a huge problem for us, but could be an issue for people with limited mobility or very young children. It's probably also worth mentioning the apartment is very warm (even in Autumn!) and I imagine it could get very uncomfortable in the summer. You can open windows to ventilate, but the area is quite lively so you won't want to leave them open at night if noise worries you. That all said, it is fit-out to a high standard with terrific bathrooms (great shower heads!) kitchen and laundry facilities. Beds are very comfortable and the linen provided is of the highest quality.
Last, but not least, communication with the reps at the London Agent was straightforward and our check-in easy.
All-in-all, this apartment suited our needs perfectly and we would recommend it without hesitation to any family looking for a well-equipped and well-located base from which to explore central London.