I had a two week stay at Leman Locke for work-related reasons and it had everything I needed. It's clean, modern, has good WiFi for work and a shared working area complete with cafe! The only slight drawback was not much storage space for clothing but I suspect most people aren't doing extended stays here. The staff were exceptionally helpful, quick to respond and this really made a big difference in the context of being time-poor for work and having just moved to London. Highly recommended.