We loved staying with Maria! Our room was very comfortable and had a great view of London. Maria's place is close to public transportation and was very easy to get to from Mornington Crescent and St Pancras/Kings Cross Station. Maria was a very hospitable and friendly host, and made sure we were comfortably set up when we arrived. We didn't take advantage of the common space or kitchen, since we were out during most days, but we did use her washing machine which was very convenient.
The water pressure for the shower is very low and doesn't warm up quickly, but we were warned about the low water pressure beforehand so it wasn't an issue for us. Some people have mentioned the location as scary, but this entirely depends on your background. Coming from New York, I found the surrounding area to be very quiet and safe in comparison, and we (two short girls) weren't worried even when we walked back around 10-11 PM.
If you like cats, her cat is adorable!! :) Would definitely recommend Maria's place to stay in London!