Add punctuation: It certainly makes a big difference in my head to understand epigenetics and feel a bit more in controlKeith London UK
A: It certainly makes a big difference in my head to understand epigenetics and feel a bit more in controlKeith, London, UK

Add punctuation: This tells us that the last reviews come from real guests like you
A: This tells us that the last reviews come from real guests, like you.

Add punctuation: This apartment has a lounge room with a sofa and TV It offers a kitchenette with microwave fridge kettle and toaster
A:
This apartment has a lounge room with a sofa and TV. It offers a kitchenette with microwave, fridge, kettle and toaster.