I just spent 1 night there in July but I was highly impressed by this hotel. Usually, I don't expect much from a chain hotel - even if I often choose chain hotels for my business trips as they guarantee at least a certain quality.
This hotel has been recommended to me by a colleague so I booked there. Location is in Eschborn, a little outside of Frankfurt but with good public transfer so no issue there as I was by train (You'll find free busses from the commuting train station to all locations in Eschborn but this hotels was just 10 min away - easy walking distance). Many international companies are situated in Eschborn and the hotels there are prepared for international business travellers.
I got a warm and friendly welcome arriving late in the evening, I could even choose my room preverence (not ususal practise for just one night stay).
The room was a standard room, not very spacious but everything done with nice, relaxing and warm colors which gave the standard Accour group hotel room a kind feeling "like home". Room and bathroom were spotless clean, shower gel, body lotion etc fresh and nicely arranged in the bathroom.
I went down to the restaurant looking for some food (as I wrote, it was quite late in the evening) - no issue there, good choice on the menu but I was asking for some vegetarian food. The chef recommended some veggi options I could choose from which were not on the menu and after a short while my food arrived - all freshly cooked, friendly served and really delicious. And this was really outstanding as I never expect this kind of extra service and high quality, especially not from a chain hotel (where I usually end up with a salad and some bread).
This area of Eschborn has no nightlife, just office buildings and hotels, so it was very quiet from the outside and I could sleep very well, even with the window open.
Breakfast the other morning was excellent and I could start the day very relaxed.
Overall, I highly recommend this hotel. Both quality and service are setting benchmarks for business hotels (not only for Mercure I guess). I know that just one night stay doesn't say everything about a hotel but I'll come back to this place next time to compare :-)

Recommended. Located in the business district of Eschborn, it is walking distance to the local train station. This hotel mainly serves business travelers and those attending trade shows (train is direct stop to Trade Show). On weekends, you will see more bus groups (arriving late and leaving early). Staff was quite eager to please. Rooms are a bit smallish but quite comfortable. Bathrooms are fairly large and extremely well lighted. Maintenance throughtout appeared to be good. This property appeared relatively new. Food in the restaurant while nothing exotic was quite well prepared and enjoyable. Train travel to the city center is ~ 15 minutes, ~ 5 minutes to trade shows.