Stayed there two nights last year between jumping from the Camino Aragones and starting the San Salvador in Leon.
I stayed in the Abba Jazz hotel, I think I picked it because it was central and near the train station, it was clean, rooms spacious and minimal but in a good way. Just had a quick look on TripAdvisor and some of the complaints range from small to noisy, my room was big so have a look at them, I didn't notice much noise its central but not in the late drinking area which is in the old quarter 5 minutes away but spending about 30 nights in dorm rooms previously could have altered my perception of noisy.
They have a big pintxos festival in June, lots of places doing 5 pintxos with a glass of wine for 10 euros, some were really imaginative and top quality. The old quarter at night is busy but relaxed at the same time, less like Leon a bit more like Oviedo with its more left type trendy bars, places and characters.