Money saver: Stay at the Imperial College London in South Kensington when school’s out. The standard rooms have shared bathrooms, so be sure to ask for a room with “en suite,” if that’s what you want. Available late June to September.

Southside Hall (has en suites), Garden Hall (shared bathrooms)
Princes Gardens, South Kensington, SW7
+44 (0)20 7594 9507/11
www.imperial.ac.uk/conferences/