Location: 9/10 not much to do around the flat, but it's a safe enough neighborhood and less than 5 min walking from seven sisters tube station, which gets you to central London in 20min.
The couch: 8/10 sleeps 2 people comfortably
The bed: 3/10 easily the worst mattress I have ever slept on. Felt like springs and plywood - kept me awake most nights. Don't stay in the bedroom if you're a light or particular sleeper