Pros: Christopher is a very friendly and responsive host. The location is central, and you can easily catch transit to all parts of the city. We found it very easy to walk from Soho and central London back to the flat. The bed was very large and comfortable. There's a decently stocked kitchen.
There are a few downsides, though. The rooms are very tight. We had a small desk and some shelves and hooks for our clothes, but it was cramped for a couple. We arrived with only small backpacks for a few nights, but a large suitcase would be a challenge.
The other downside is that there are 4 rooms (up to 8 people?) sharing one shower (and 2 toilets). We had to wait most mornings to shower. Lastly, while the place is quite clean, I found it to be scrappy. A fresh coat of paint, a little update would go a long way. But this is personal taste, and my partner didn't seem to mind.
In the end, London is expensive, and Christopher's place is reasonably priced. So decide what matters to you.