Overall: Nathan’s place is a short walk to transportation or a nice walk (but long, maybe 30th minutes?) into London. Nathan’s flat is clean and has nice touches like earbuds if you’re not used to city noises, a hairdryer so you don’t need to pack one, and a nice welcome note.
Helpful things that could be included in the check-in instructions: Be sure to pull the door towards you as you’re opening the locks. The bottom lock will seem as if it won’t turn beyond halfway—it does but it’ll catch and make you think otherwise.
When I finally got the bottom lock to turn full way around, pulling the door towards me was the only way I was able to open the door after 20+ minutes of feeling like a fool for being unable to open the door. Don’t knock next door hoping a kind neighbor might help, she’ll slam the door in your face (legit). And don’t call Nathan unless you want to politely further your humiliation.