No matter where you decide to stay, keep in mind that the Landsdowne Road DART station is 5 minutes away from the con, so anywhere along the DART will make getting there really easy. It also means you won’t experience any disruption during the marathon or if bus strikes fall on that weekend. I’d recommend sticking to the south side which would mean you could walk back if you decide you don’t want to leave the con before public transport shuts down.
Hostels – €20+ per night
There are budget hostels everywhere in Dublin city centre. One site to check out is HostelWorld, which makes it really easy to find a both hostels and discounted hotel rooms. The Kildare Street Hotel for example (as of writing) has rooms for €30 per night and is just a 20 minute walk away from the con.
Hotels – €90+ per night
Trivango is your best bet for discounted hotels, but sites like booking.com and laterooms might be better if you’re doing a late booking. It’s going to be the priciest option you have available to you though, but if you want comfort, why not.