The Gresham is a lovely old dame, and we got a great deal on hotels.com which allowed it to be within our budget. When we arrived, we learned they had upgraded us to a larger room, with a nice-sized bathroom and excellent tub - very big by European (and older hotel) standards. The lobby is beautiful with a nice bar area and cozy place to sit and have a drink. We found the service generally to be adequate but a bit icy – not as warm and friendly as the rest of Dublin – and didn't try the room service.
A few odd things; first, there was no minibar. Mind you, there was a minifridge in our room, but it wasn't on, and there was a note saying if you wanted to partake in the minibar they'd be happy to stock it for you. I found this odd as usually hotels delight in charging you the exorbitant minibar fee for your bottle of water, which is exactly what I would have used it for, but instead we had to order one up to the room. A bit inconvenient and just not what you'd expect from a more expensive hotel. Housekeeping was a bit odd as well - our room was thoroughly cleaned each day but didn't do the usual tidying up, which I assume is to prevent thefts or accusations. Concierge was not overly friendly, again, just something you expect when you are staying at a four-star historic hotel. In short, they don't bend over backwards for you here, but it is a perfectly lovely place to stay and a great value as long as you can find a deal. One caveat, we saw the standard rooms, and they were a touch small, so go for the upgrade if you can.
If you are looking to splurge on a romantic weekend away, the Gresham was once good enough for Liz Taylor, but I would think there are now more elegant places to pamper you in Dublin.