If you are looking for an affordable stay in Dublin, I would recommend this stay for a night or two if you are not planning on being home a lot.
You will be staying in the sub-urbs of Dublin that is well connected by buses (20-30min to the center). The room in itself is nice but not very cozy. The shared bathroom is clean.
Sean is very welcoming and helpful.
In case you are looking to stay longer in Dublin, I would recommend a hotel closer to the center (although it‘s more expensive).
Ps: bring coins for the bus tickets?