Appreciate the note re boutique, but we stayed in the Novotel on the edge of Reims and it was excellent. A bit on the large side but quiet, comfortable and with good food and a nice pool for that essential cooling off with a beer hour when you first get to the hotel. Otherwise, we always do well with Logis although we prefer them to be away from the larger cities.
Make sure you detour to look at the old Grand Prix stands whilst in Reims. The cathedral in the city centre is worth a look - there is a secure underground car park very close to the cathedral.