Hotel Nagyerdo is a reasonable quality 3 star hotel. I only spent one night there and I didn't use any of the hotel's special services, but they offer spa treatments, conference rooms, etc. The hotel has classic and superior rooms - superior rooms are slightly bigger, have been recently renovated and are located in the tower building, so they provide lovely views on the park, the nearbly pond and even the city. Classic rooms are smaller and they are situated in the two-storey building of the hotel. I stayed in a superior room and it was nice - decent size, clean and comfortable.
The hotel is located in the Nagyerdo ("grand forest"), a large public park in Debrecen. The views from the tower are very nice.