we were a group of 6 going visiting Dublin for a tech conference. Smooth stay. The host provides detailed info upon arrival. Keys to the flat are in a lockbox which you receive a code for, so you never actually need to meet anyone. Probably not an advantage for those looking for personal touch and conversation with the host, but for us it was perfect. It's quite efficient and time saving, not having to sync with anyone for keys handover.
The only thing, the beds were a bit small for two people who are not a couple. Otherwise the house is really spacious and quite nice, typical old Irish house. Nice atmosphere. Even had a terrace.