My wife and I recently stayed at the Lanson over a long weekend.
Overall we had a very pleasant stay. The staff were courteous and helpfully. The room was a decent size, modern, clean and well maintained. What we especially like was the use of the Handy mobile phone. This was absolutely amazing and I would recommended every hotel providing the same service. We had the use of 4G, could make international calls and get guides on local attractions whilst out and about, all for free.
The only reason for not giving a 5 star rating is that when we asked the concierge for recommendations for a place to get a massage we were directed to a men's club. In all fairness it was 10pm and you could only tell it was a men's club/sauna after having entered. But they should have known better, this was definitely not appropriate for a newly wed couple on vacation.