If you choose to earn airline miles instead of collecting points in Le Club Accorhotels, Accor will give you 3,000 Miles & More miles on top of the usual 500.
Note, however, what their definition of a qualifying stay is:
A stay is defined as one night or several consecutive nights in the same hotel: at least one night at Sofitel, Pullman and MGallery hotels, at least two nights with Novotel, Suite Novotel, Mercure and Adagio, at least four nights at ibis or ibis Styles hotels.
Since you need to stay more nights at the cheaper brands to qualify for miles, this promotion is never going to be worth a mattress run (where you book a local hotel, check in and then go home).
That said, if you are travelling in a cheap part of the world, such as Asia, it would represent a significant rebate on the cost of a Sofitel, Pullman or MGallery room. I found the two Pullman hotels in Bangkok at £58 for a random Saturday in November.
However, if you are active in Miles & More then this is not a bad deal if you are doing the stays anyway. Lufthansa miles are not the easiest to earn, especially as they are not an American Express Membership Rewards partner.
(To see our complete list of all current hotel promotions for the major chains, click here to visit our ‘Hotel Promos’ page or use the link in the menu bar at the top of the page.)