We had a very pleasant journey at Donovan's. Everything we could have needed in the room was available.
If I had to point out one thing, I'd say the lock could be changed in the bathroom, a bit hard to put on.
Underground and bus stations (mainly at Old Street) give you an easy access to central London.

Plus our host was really kind and helpful, and made us discover some fresh rising reggae artists. ;)

Definitely a good experience and looking forward to seeing you again.