We had a great stay at Sheng & Dido's place. Good location. Pimlico isn't too far away from the center of London and it's a quiet area. From St Pancras you get the Victoria Line which is direct to Pimlico. It takes about 10-15 minutes on the tube. You're a 15 min walk away from Tate Britain which is great.
Check-in was very convenient and easy, place was clean, bedroom was cosy, good communication ensured (I had a question and Sheng answered very quickly). Kitchen is well equipped (oven, washing machine, fridge) where you can find things to eat for beakfast ( jam, peanut butter, chocolate spread, cereals ans toasts, milk, tea, kettle). Last but not least the bed is so comfortable I slept like a baby! That said, we were pretty rudely awakened by a thunderous sound of drill right next to us on our first morning... Ouch.
Overall it was a very good experience, I recommend!