The rooms in the Grand Hotel Gobelins are typical size for old school Paris - that is, very small with minimal table/desk space for luggage/personal items. The rooms are clean and outfitted with coffee/tea service, and are generally well lit and quiet. The bed was comfortable. The bathrooms was very bright and clean, though I did need to have a towel replaced that had a small stain.
The front desk staff and other hotel staff are friendly and very accommodating. Overall, it's a decent hotel if you just need a room to spend overnight time in. The Gobelins Metro stop (Line 7) is easily accessed around the corner; however, the next nearest stops are a bit of a walk, including Campo-Formio which does not have a well-lit path. Easy enough to utilize Uber instead.