We used Jemmas (at first when through Porse, but they were so slow it getting back to me and keeping on mucking us around and Jemmas was so it and found me someone in a couple of days). Jemmas doesn't have a minimum numbers of hrs per week and their ratio is the same as the others mentioned- 4 child max, 2 under 2's and only 1 little baby.

Ella started in home based care about a month ago- we both love it .  I personally wasn't that keen of putting her in a daycare at such a young age and really liked the idea of being able to choose exactly who looked after my baby. Our educator is absolutely lovely and loves Ella to bits. She also has her 3 year old son at home and 6 year old daugher (during school hols), but apart from that is only looking after Ella, so she gets heaps of individual attention. Also she is able to stick to Ella's routine and because she is with her all the time is able to notice if she is little bit more tired than usual and needs to sleep a bit longer- for instance on Tues Ella was really clingy in the afternoon so she gave me a call later on in the evening just to make that Ella was alright (which I though was really nice).

Ella still gets some socialisation as the 3 & 6 year old love playing with Ella, but she also gets the individual attention that she needs. The plan is we will probably continue with home based care until she is 2, then put her into daycare.

Also the advantage with home based, is that you can basically choose your hours and if you working parttime it works out cheaper (at least it did for us)- I pay $4.50 an hr. 

I don't know if you would be able to find a daycare that would have her only for 6 hours a week. Most have a minimum of 3 6 hour days a week.