The building is very centrally located and the room itself was very nice, as was the kitchen area. Bathroom also very convenient and clean. However, a couple of points:
1) There is no customer service, despite a notice on the office door saying staff will be there 10-4 on weekdays. I wanted a couple of things - to borrow a hairdryer, and to see if I could leave my suitcase for a few hours on the last day. But there was no one to ask. I emailed the address on my booking confirmation, but never received a reply. I was reluctant to phone as it would have counted as a call from the UK on my cellphone plan. If there are no onsite staff during summer holidays, you need to take down the notice saying that there are. And if staff don't answer emails, remove the email address from the booking confirmation. But relying on a mobile phone number alone is in my view not adequate.
2) The room was quite noisy, due to construction work going on directly outside. But presumably this is a temporary problem.
3) Another visitor was also looking for a hairdryer. I think this is definitely something Granville Hall should provide. Perhaps build it into the wall of the bathroom, as many hotels do.
4) In the end, I had to pay a completely separate business to hold my luggage for a few hours - an extra cost which would probably have been avoidable if I'd been able to speak to someone. Not ideal.