Eleanor Tiernan & John F. O' Donnell: Irish American

The Guilded Balloon's aptly named 'Wee Room' must surely take the title of smallest venue at this year's Fringe - the audience is crammed so close to the 'stage' that you're almost frightened to blink in case the noise puts off the performer.

Eleanor Tiernann doesn't seem to mind these crampt conditions, indeed she seems to positively thrive in them. Her huge smile never wavers and her infectious, earthy Irish humour gets laughs a plenty. One out of two jokes she cracks is terrible, but they are worth hearing just to hear another of her self-deprecating put-downs.

Part of the Tiernann entertainment dynasty – the cousin of the more well known Tommy – she's a natural in front of a crowd. She has an endearingly ramshackle performance style, which the naïve might presume to be amateurish but which is clearly a calculated move. You get the feeling she'd act the same whether she's playing to 20 or 20,000.

The whereabouts of the show's co-headliner, John F. O' Donnell, give proceedings a surreal twist. Tiernann claims he's simply not turned up, much to her apparent horror. But as she ambles through her set, pausing every now and then to curse her supposed partners disappearance, you begin to wonder if its all one big hoax. If it is, it works well. If it isn't – well, full credit to Tiernann for managing to put on a decent performance regardless.

So, does John F. O'Donnell actually exist? Answers on a postcard please.