Overall about 4.5*. Great location. Easy access to central London. 10 min walk to tube station and right off the A41 and M1 if driving. Had a parking space right outside.
Apartment was small. Good for single travellers or a couple. We travelled as a couple with a young child and it was a little too cramped in the end for the three of us.
Everything worked well, had everything we needed in kitchen and bathroom. They provided shows-gel and shampoo which was helpful. Check-in was simple and communication with host was good. Did have an issue that there wasn't a coffee machine even though it had been advertised, but credit to the host who brought us a new on the next-day. Only real criticism is the couch is really uncomfortable.
Would recommend to others