Piers' flat is well-equipped, clean, and homey. The location, in Camden Town, allows quick access via the Tube to all the sights of central London, while also being in the heart of a vibrant and bustling neighborhood. You're also in walking distance to Regent's Park and Primrose Hill, two of the most delightful green spaces in the city.
If there's one issue worth noting for future guests, it's the fair amount of noise from the main street (Mornington Crescent) throughout the day, and especially in the mornings (from 8:00 or so onwards). The loading dock for the massive Carreras Building is right outside the apartment, and lorries/trucks of various sizes come calling throughout the day. And Monday rubbish/garbage collection is especially noisy.
Of course, none of this is Piers' fault: it's just a factor of life in the big city. And if you're using the flat as a base for exploring London and you happen to be out and about for most of the day, you probably won't notice any of this. (Clearly, previous guests either didn't hear it or didn't mind it.) Or, if you sleep with the bedroom door closed, that will dampen a good deal of the commotion. However, if you're hoping for some contemplative time before noon, you might not have as much peace and quiet as you'd like. I should add that this is more or less a weekday issue; weekends are appreciably less noisy overall.
All of this said, you're in London. Your host is friendly and readily available for consultation. The flat itself is modern and comfortable. And you're well set up for your holiday. Piers' place offers good value, and I recommend it very strongly to my fellow travelers.