Hello,
I would recommend them without hesitation. We have booked throught them a few times, excellent to deal with.
The staff in Duke Street, Dublin 2 have always been very good to deal with, based on my own experiences.
Oh, btw - if your going to San Fran make sure you book your tickets well in advance for the tour of Alcatraz. We went on the last tour in the evening time, so it was dark outside ... added to the experience, also very interesting to see the armed guards coming onto the island as we were getting onto the boat to go back to San Fran. Tickets can be booked directly, via their website btw.
The Bridge, Chinatown, a few goes on the Trams, maybe a quick visit to Knob Hill ... then a bit of shopping. We also went to a show one of the nights there, there's a cheap ticket place (can't recall if it's tkts or a competitor but it's down on the square selling tickets for most shows, same day at heavy discounts if your happy to queue)
Seven days will probably be far too much for San Fran alone btw. Unless your thinking of taking a couple of days up in Napa Valley perhaps, there are lots of places you can stay overnight, including a number of places situated at the various vineyards which do great meals to accompany their wines.
I'd say 4 days would be plenty in San Fran to be honest.