I found Thompson LES to be comparable to other boutique hotels I have tried in most respects, with the notable exception of their service, which greatly exceeded my other experiences.
In particular, our reservation was complicated as we had three rooms booked using booking.com, we changed the names under which the rooms were booked, we cancelled a room, we arrived at different times so the confirming credit cards were not always from the people who were staying the room, etc. This created a few billing issues a the end which I do not attribute to being the fault of Thompson, more to do with the complexity of the transaction(s). They remained professional, cordial and helpful at ALL TIMES during the discussions that I had with various staff, in particular Sebastian at the front desk, with whom I spoke numerous times. In fact, they were helpful on premise, by email and by phone. They also tried to make sure we understood what the next steps were and made recommendations for follow-ups that were beyond normal service requirements. They never made us feel as though we were being unreasonable and apologised numerous times for any adjustments that needed to be made. In other hotels, I could imagine a somewhat less courteous approach would prevail.
In terms of the rooms, etc., they were reasonably sized and decorated for an upscale boutique hotel. The bar service was also excellent.
The gym was slightly cramped, but functional and did not feel so much as if it were in a basement (which it is).
Hats off and a big thank you to them!