All in all I am giving this 5-stars. I think it's a 5-star worthy hotel, and most people will LOVE it!
For me... it could be better and here's why: Hallways near the floor boards are covered in dust. Wall paper and grouting inside the rooms have seen better days. The staff is a bit pretentious. The the topping on the cake is the horrible Cassette bar on the top floor. The drinks there are over priced and poor quality.
Also the overall layout of the hotel is confusing. You have to take an elevator, to walk further, to take another elevator, etc. I had to give people directions how to get places inside the hotel because people kept getting lost.
If this was a "budget" hotel, I wouldn't think twice about these things. However I would expect everything to be 10/10 for a Sofitel branded hotel.
For the good side: Amazing views of Lumpini Park!!! Coffee Pod maker provided. Excellent Wifi for working with a great desk area. Two different street access entrances for Grab or Uber to pick you up and/or leave. The restaurant a-la-carte menu was fab for lunch! Welcome Drink was tasty. There was a rooftop bar called Hi-So which did actually have amazing drinks, cheaper than that other place. Amazing coffee shop downstairs with trained baristas and loads of drinks options. The chocolate cafe had excellent croissants and sandwiches for breakfast.
So I think all-in-all I wouldn't stay here again. But I think for a young person who wants to feel cool and hip, this is the sorta place for them.