Yes - one is a short walk across the park, the other is a few tube stops (Queensway and Bayswater stations are both no more than 200m from Lansdowne).
The plan is that the week will be split to avoid too much travlling between the Colleges - ie 1.5 days at one, then 1.5 days at the second and then 2 days at the third.
Hope this helps.