Hi Lindy,
Thanks for reaching out, it's great to hear you are planning to visit this July.
Please check
this accommodation page on Tourism Ireland, I have set the filters to B&B and Dublin for you. I would also recommend trying
B&B Ireland, and
airb&b (I have set the location to Dublin 2 for July, but you can alternate to D8). I hope this helps.
Let me know if have any other questions.
Cathaoir