This hotel is nicely priced, with an excellent location. Short walk from La Cite (where I was attending a conference), a half block from the Chateau and Cathedral, a few blocks from the train station (no need for a taxi), a few blocks from the wonderful city center, and easy walking to the gardens. The rooms are sparse, but clean, the staff is friendly and helpful (make sure to arrive before 11pm for check in as the front desk is closed afterwards). They also provide a decent breakfast for a few euro. The internet is fairly fast, and free. No worries about having items stolen from my room, but they did not have safes in the rooms. Also, the neighborhood seemed fairly safe, and the street is fairly quiet for those sensitive to noise.
All around, an excellent choice for a budget traveller who wants a clean, secure room that is within very easy walking distance of most of Nantes' main attractions.