The Beetle Cabin is perfect for 1-2 people staying for a weekend.
Although you don't have a cooking space, you still have a microwave, toaster, coffee mashine and a kettle - the basics that you need :)
We had a lovely stay in the well decorated cabin in Gunther's garden. Anyone cann tell that Gunter likes to host guests and his suggestions for public transportaiton or places to see were so very helpful.
You can reach the place either by Metro or by bus, it is around 45 minutes from London city center.