We stayed at Leia & Keri's for 4 nights over the COTA F1 week/weekend.
We stayed in the room just inside the front door which felt really private. Room was clean and tidy with good facilities, bathroom, wifi, tv etc.
Leia & Keri were very helpful in supplying us with information running up to our visit, responding promptly.
The only downside for us was the lack of public transport in the area, we travelled into town by bus every day and the nearest bus stop with service early in the morning is about 25mins walk away. Buses were $5 for a day pass which beats a $40 taxi round trip! If you use the bus get a 10, 3 or 801 from Southpark Meadows to get into downtown. We used the 801 mostly - it's faster ~25-30min.
For other potential F1 fans. Their house is fairly close to the circuit but you'll need a car or taxi to get there as the public transport in the area is, not very well developed. We used buses into town where there's a shuttle bus all 3 days of the race weekend.