I stayed here with my wife for just two nights, after a business trip. The experience was unreal: we were treated like royalty on every occasion. My wife was overwhelmed with the level of service and attention to detail; we were never even slightly disappointed.
We arrived at the hotel on Friday just before noon, two hours before the advertised check-in time. We were greeted at the entrance and our bags were whisked away. Then, rather than standing at the check-in desk, we were immediately offered a comfy sofa, a cold flannel and iced tea in the Lobby Lounge while our details were being processed. The staff on duty came to us if they needed anything (e.g. passports, hotel voucher, signature, credit card). Instead of being told we couldn't check in yet, we were upgraded from a standard Club room to a sea view corner suite (without asking). The check-in clerk (a young Russian woman) then escorted us to our suite on the 27th floor.
The suite was spotlessly clean and beautiful. It had an entrance hall with fitted wardrobes; a lounge with floor-to-ceiling panoramic windows overlooking the beach, lounge furniture and a large LCD TV; a dining area seating four; a study area with a large desk and chair; a kitchenette with an empty refrigerator; a separate toilet; a beautiful bedroom with a huge bed, other furniture and another large LCD TV; and an amazing bathroom with a bath, a separate shower, bidet, toilet, sink and all the towels and potions you could desire. Our 'butler' was there when we arrived, and he showed us around the suite and asked us to call him if ever we needed anything.
There was a little confusion about our reservation (whether it included access to the Grosvenor Club) but this was quickly resolved in our favour, without fuss. We were also given a voucher for free Internet access. Our bags arrived a few minutes later, and once we were on our own all we could say was "Wow!"
I had assumed when I booked that all Club rooms included access to the Grosvenor Club, but apparently this is not the case. The problem with most fancy hotels is that all the extras are very expensive, even if the room rate is reasonable. The Grosvenor Club solved that: it included Champagne breakfast, all-day refreshments, afternoon tea, and per-dinner drinks with canapes. All of these were available in the Grosvenor Club Lounge on the 44th floor (but you could opt for 'ordinary' breakfast in the main restaurant or room service instead). This is a bargain! We treated it just like an all-inclusive holiday.
The hotel is not on the beach, but a shuttle ran continuously (between 7AM and 2AM) to and from the Royal Meridien just down the road, and Grosvenor House guests had free use of the gardens, pools and beach facilities there, which were fantastic. Any charges could be made to our room at GH, and the service there was just as good too!
As others have noted, Dubai is just a big building site and most hotels have some construction nearby. Grosvenor House was somewhat isolated because of the surrounding road and building works, but it never really bothered us. This was because: 1) we arrived on a Friday, which is the equivalent of Sunday in the West; 2) we were on a high floor, so noise was not a problem and our view was not affected; and 3) we ate and drank in the Grosvenor Club, so we didn't have to go out to find local restaurants. It might be more of a problem for guests staying in 'standard' rooms or those with children.
I haven't mentioned all the other ways the hotel exceeded our expectations, such as the beautiful bath robes and slippers, the fresh fruit, pastries, flowers, wine, chocolate delivered to our room, or the late check out ("No problem, sir, and you can use the Spa and Grosvenor Club too."). How many hotels service your room on the day you check out?