I'm contemplating making an extended stay in London around the Who Do You Think You Are Live event next February. Various friends have stayed in long(er)-stay accommodations so I asked BIFHSGO colleague Brenda Turner, who stayed earlier in the year, for advice.
"I regularly find it more convenient, cheaper, and much more flexible to rent a cottage or flat than a hotel room, whenever I happen to be staying in one place for more than 5 days. I've rented flats or cottages through these companies, plus others in locations which would not be of interest to you. Even when dealing with owners directly, rather than a company, I have never once been ripped off in any way in two decades of rentals. Most often, I have found the owners very friendly and helpful, and most anxious that I enjoy my stay. In London I find it best to book as close to tube stops as possible, and especially I try to find rentals to which two tube stops on different lines are walkable, for mobility in case one line is down for maintenance, or accidents.
Here are the companies I have used in the UK:
Vacation Rental By Owner: http://www.vrbo.com/
Home Away: http://www.holiday-rentals.co.uk/
Country Cottages: http://www.english-country-cottages.co.uk/
Apartments Apart: http://www.apartmentsapart.com/london_hotels/index.htm
Holiday Lettings: http://www.holidaylettings.co.uk/Glenn Wright mentioned http://sabbaticalhomes.com/
The new company I heard about from a chum just a few days ago is called Saco. This chum and family rented a flat just by the Vauxhall Bridge, and were astonished to realize that they had a balcony overlooking the Thames during the Jubilee Flotilla, which they had not planned for at all! They were very pleased with the services they had as well. http://www.sacoapartments.com/"
Please share any experience you have had with these or other similar services in the comments.