It's not that fancy a place. Location is pretty good though. Walkup between two shops to a reception area and two small offices. Sort of behind the places that are actually on Diagon. Loft is pretty big, but unfinished, so I'll throw it in at no extra charge if you're interested.
I've sent you the keys via owl; you should have them any time. Let me know what you think. Rent or buy, up to you.