Liz's apartment is highly over average standards. Very confortable for 4 people. It's perfectly situated if you want to visit central London - next to (5 minutes walking) Northern and Piccadilly lines (2 stations from Leicester Sqr) and Regent's Park.
The apartment has everything you might need. It's fully equipped, very clean and well maintained and the terrace in spring and summer is a plus, you can see the London Eye from there. It is extremely calm and everything worked well. Being close to BT Tower is also quite convenient, since you can situate the apt. easily from almost anywhere in London. Also you may find all kind of shops in the area.
Liz is very warm and responsive. She answer any query instantly. You also may find all kind of information (about the apt., the area and things to do in London) in the apartment to make your stay very easy.
Should I come back to London, definitely I will try to stay in this apt again. Highly recomendable with kids.