Just book now.
Things I look for in reviews are proximity to other things in the area/transportation, friendliness of host, and how good the local bar is. This B and B was two houses down from the Rainbow Hostel bus stop! It's walking distance to all three pubs in town plus all the little shops. We spent almost our entire day at McDermotts pub (we got in late afternoon and really wanted to see the live music that started at 9:30 but knew if we went to sleep we wouldn't make it back out). The food was phenomenal and the MUSIC!!! So worth the wait. By midnight I think everyone in doolin was at the pub. Olive and Chris have a lovely place. The rooms are comfortable and very clean. The bathrooms are hands down the best I've experienced in my backpacking career. We took the "traditional" breakfast and it was sooooo good! A great way to start the day. In addition, they helped us arrange transportation at an unbeatable price and gave us advice about our sightseeing plans!! Chris was able to talk my dad out of an 830a trip to the cliffs of moher and I can't thank him enough for that ;)
Overall, we would 100% book again. This place was perfect!