Sabrina,
I have recently gone through all of this and it's a nightmare. There could be a couple of reasons why you agent is going this;
a) Maybe you're agent is not saying take this one, rather saying that he "currently recommends" this current bid.
A good agent has to assume you know nothing about mortgage approval and the advantages a first time buyer/investor has over other people in a chain who have to sell their property.
b) Your agent will know from experience, that if another bid comes in from a bidder that is in a chain, they must surpass the higher bid in order to look more attractive that the "cash buyer".
This could may cause the "cash buyer" to match or even better the "chained" bidder, but not nescessarily. This cash buyer maybe have previously agreed with the agent to pay him a bung if they can get it at a lower price. This highly unlikely if the agent if from one of the big agencies. (Sherry Fitz, DNG, Lisney etc).
From recent experience, I would do the following.
Go ahead with the viewings and ask the agent why he is in such a hurry to go sale agreed. You agent has no doubtly laid out what your fixed fee will cover. National advertising in glossy magazines etc. This, with other stuff, may cost around 400 euro. Ask him is he prepared to waive this fixed fee.
After the weekend, more bids will come in on Monday afternoon. Get your agent to contact you via email/text or phone. The agent is obliged to contact the first bidder about the current higher offer. More people may schedule for viewings over the next couple of days. Let it lay for the rest of the week. Over the next weekend you may have more viewings and more bids. Bids come from viewings. Then let these viewers think over the weekend, they may also enter the fray. The earliest you should go "sale agreed" would be the 20th March.