Being located slap on the central square, this hotel couldn't be better located for those wanting to stay in a central location but I would advise you sort out directions to the hotel (or rather to a car park nearby) before you travel rather than rely on Sat Nav - mine just could not cope with the labyrinth of one way streets and no access roads and I ended up in a car park half a mile away that charged me 18 Euro for overnight parking.
The hotel staff are very friendly and helpful and the rooms have real character - contrary to one of the other reviewers, I thought our room was spacious and comfortable. The room was quiet - probably as it did not face onto the suare itself. Breakfast was good.

I arrived late in the evening, the kitchen just closed, but they managed to get me some food which was all I needed. A nice glass of wine, and some food, now I could relax after a long day working and travelling around Netherlands.
The room was really good, the only disappointment was that someone had a cigarette in the bathroom, this was a non-smoking room, and there were ashes on the floor. It stank in there, and made me wonder if the standard of cleaning were any good here. But all I needed to do was to close the door and it certainly didn't affect my good night sleep.
Other than this minor inconvenience, it was a really nice stay, friendly staff and great location.
Breakfast was OK, nothing fancy but fine.
There are some major work been done in Groningen, affecting the hotel's approach.
I would stay again at the "De Doelen" hotel.

I stayed in a VIP Suite for two nights.

The hotel is on the Grote Markt, which is perfect if you want to explore the pretty town of Groningen. We travelled by train, so didn't have any problem with parking,

We arrived at the hotel at 13:00. but were able to check into our room early. The staff were all friendly and helpful. The bedroom wasn't huge considering is was supposedly a suite, but the bathroom was magnificent with a large jacuzzi bath, rain shower and a private sauna.

There are no less that four cafes attached to the hotel which are run by the same company. Service was quick and efficient and the food very reasonably priced. The quality of the food was acceptable, but definitely nothing special. Breakfast was the standard Dutch selection, but the coffee was of an unusually high quality.

Stayed 1 night. The hotel is right in the central square of Groningen; a lovely Dutch town. The bedrooms are a bit odd as they are small and oldy worldy but with huge modern bathrooms with walk-in showers etc. Having said that the hotel is certainly somewhere I’d stay again. The staff were really helpful and cheery. Very clean, nice breakfast. Recommended for a visit to this nice town for a few days.