I stayed here 3 nights on a business trip. The hotel is just off one of the Shinkansen Railway Station exits, hence superconvenient if you arrive to Osaka by train. Very large room, supercomfy bed, not crazily expensive considering that Osaka/Kyoto are quite pricey. Quick check-in and, obviously, great service and welcome from the reception staff. The neighbourhood is not so great, however it's super easy to use the metro, take a taxi or Uber to move around the city. Once again, if you are arriving/departing by Shinkansen it's just perfect, I would definitely be back,

As perfect a hotel as I have come across.
Lovely new building, helpful staff. Very well fitted out, very spacious rooms.
Very well located right next door to the Shin-Osaka railway station (not to be confused with the Osaka station across the river).
Quiet and comfortable particularly so close to the roads and rail.

I am a Marriott Platinum member. When I arrived, they did not greet me as such which has never happened before. Nor did they offer me my gift, which again is unprecedented. I had to ask for it. Nor did I receive any room upgrade. Ok, maybe that was just a bad receptionist (but previous reviewers have made the same comment).

Then I went to the bar on 19. They gave me a Pepsi but the ice was so much that I literally had one sip before it was done. I complained and they gave me another one. Then at the end she charged me for both sodas. When I explained about the ice, she initially refused to take off the first soda from the check. I insisted and they eventually took off the charge but still argued with me that the ice content had been "normal" and that no one else had complained. The irony is that as a member of Marriott rewards I could go to the lounge next door and take 20 pepsis from the fridge for free. So why argue with me? And see for yourself the ice in the attached picture.

Then the food was terrible in bar 19. We had fish and chips; the fish was goujons, and smelled fishy.

Then my card didn't work for the executive lounge. They changed it for me. But the changed card now didn't work for the room. So I went down and changed it. It STILL didn't work. Finally, on the third try, I got a key that worked for the room and the lounge. For the night I had just arrived and was jet lagged, this was a terrible start.

But it got better. The room was pretty nice. Bed was comfy. Breakfast is good and varied. Generally service was decent. English wasn't amazing from the staff. Executive lounge is lovely with good food and drink (except for some burnt and greasy spring rolls, picture attached). But best of all was the location. Coffee and restaurants in the station next door. The Shinkansen to Kyoto and Tokyo next door. And the Jr line into Osaka was very convenient. It's a great base for this region. All in all, we enjoyed our stay and would definitely stay here again. But the first night was difficult and can be ironed out by the general manager by imposing true Marriott standards on the hotel. I give it three stars for that but it could easily be 4 or 5 with some better management.