We thoroughly enjoyed our stay here. The hotel is steeped in history, is a real pleasure to explore and the grounds are beautifully kept. We stayed for two nights and I 'did' the museum while my husband played golf, we cycled around the island (the hotel provides bikes for hire), we walked and we sat on the balconies in the sun.
On the downside our room was decidedly dated and tatty, although clean. The paint was chipped, the wallpaper and carpet appeared to be vintage 1980's and there was a large, repaired lump out of the bath. The room was above the balcony where the cafe is located and noise of chatting carried upwards. However, there is a flat screen, excellent wi-fi and we were in the cheapest rooms on a special deal so I can't really complain.
Don't rely on being able to eat at the Courtyard at Crane - it is often booked for weddings/functions at the weekends.
I found the guys who park cars, provide the bikes, etc a little creepy but that is a personal thing. All the other staff were delightful.
Altogether I would thoroughly recommend a trip here - it is a truly atmospheric experience.