Spent 3 nights at Pension Elf in early October 2007. I arranged airport transfers and these went very smoothly with the hosts picking me up and dropping me off at the airport on time. Accommodation is basic and clean. Hosts are very helpful, struggle a bit with English at times, but this was not a major problem.
Breakfasts were adequate but possibly a bit different from those in an English B&B.
Positives were - clean but basic accommodation in a quieter area of Prague, ensuite facilities, helpful hosts, proximity to transport (metro and trams), availability of internet. I enjoyed my stay and would go back again.