Mary's place is a great option to visit London, she's really welcoming and gives you all the information you may need during your stay.
I found the house really more than expected, cozy, modern - super clean - and with great architectural features. You're in the heart of shoreditch but the flat is quiet and you won't get bothered at all by the vibrant London nightlife.
You will have a private floor, your privacy is safe if it could be one of your concerns!
Everything you want is at walking distance, Old Street subway is 2 minutes walk, supermarket, pubs etc.
I strongly recommend this accommodation and hope to stay here again my next time in the city!