The host replied quickly to my messages and he was really kind when I arrived. He showed me around the apartment and let me know of the local places nearby. It was really close to the train and even closer to the bus (if you are planning to go to Watford, I recommend taking the bus, the way there is amazing and you dont have to get to Euston to switch trains). I can recommend this apartment to someone who is gonna be in London longer than 4 days, it has everything you need to stay there for a longer time. I am for sure going back there again! :)