Where to stay?
If you're planning on staying in Paris for more than three days, you'll probably turn to Airbnb rather than looking for a hotel. This is a wise decision, particularly when you consider how overpriced Parisian hotels are and that early spring is already tourist season.
If you plan on booking an hotel, BTU-Hotel to offer you special offers on room (mention EthCC in the search bar)
The best neighborhood (cheapest) to head to is probably Charonne, especially if you're with a partner. It's one of the few areas that's both clean and located in Eastern Paris, which is where you want to be to find bars open after 7 PM and streets frequented by locals.
If you really must stay in a hotel, les Piaules is both very cheap and close to the venue.
For a more expensive and comfy experience we suggest Le Citizen hotel or basically anything you can fin on booking.com