I've stayed here myself several years ago. I like the breakfast. Jenkins Hotel 45 Cartwright Gardens between Russell Square and Euston Road, in the crescent. Singles are GBP 68 inclusive of tax and breakfast, en suite w.c. Doubles are GBP 78 inclusive.
All rooms are en suite.
Fine Georgian crescent. Near British Library. Euston, Russell Square tube. Hotel La Place 17 Nottingham Place. Baker Street tube.