We had a wonderful time at Tara's.
This is really a cosy home sweet home, very convenient, particularly when you're travelling with kids and enjoy some time to cook, chat and play at home. One week was defenitely too short.
The location is really great : nice and quiet neighborhood with a lot of restaurants, cafes, groceries nearby (from organic store to cheap Morrisson).
Regarding the transports, there is a direct bus from St Pancras/King's cross station. Otherwise, we've taken the bus, underground, overgroung, Howgart Express and even walked with our 9 3/4-old-daughter to the city center and main attractions.
We didn't meet Tara, but communications were very smooth and her friend and mother were very nice.