We had a lovely stay at Philip's place!
The small room and bathroom had everything we needed for a nice weekend in London. Check-in time was very flexible, and we were allowed to leave our luggage behind until we had to catch our train.
Keep in mind that you are sharing the building, so you will wake up from some noises in the morning (including the cutest laughing baby). For us this wasn't a problem, but it is nice to keep in mind.
The location is about a 10 minute walk from St-Pancras station, meaning you will get around easily.
Thank you Philip!