If you are joining RyanAir directly, you should be told your base during training or you can make it part of your conditions in the contract. My class knew their bases the first week of training.
You might be told your base - but that does not mean you will get it. If you make it a condition of your contract you will be exceptional. However, you will sign a clause in the same contract accepting that they can change your base as and when they want (I know a pilot whose base was changed with four days notice, two of which were days off - during which he had to move from STN to Rome).
Pilots who are often told things at Ryanair interviews which VERY frequently are not honoured. How often, just how often, does this have to be said? The fact that somebody has had an apparently "normal" experience, as indicated by the quote above, is meaningless in comparision to the repeated experience of many, many more.
We are not making this stuff up. Every Ryanair pilot who comes here and tells you these things is not much pleased when the same people reading these warnings (one presumes) turn up on REPA a few months later talking about how they have been mislead and abused.
When you buy a type rating from Ryanair you become in their eyes a source of profit and a commodity, not a pilot.