Eskin Den is in Keswick. It's an apartment on a quiet residential street about five minutes walk from the town centre. The walk is flat, which is handy. There are two bedrooms, so it sleeps four. One bathroom. It's a 4 Star place, so it's comfortable and well looked after.
You're opposite Helvellyn Street Bakery, which is good for a coffee or a loaf of bread. The river and Fitz Park are just down the road. Keswick itself has all the shops and pubs you'd need. The Theatre by the Lake and the Alhambra Cinema are a short walk away.
For getting out, you can walk to the shore of Derwentwater. The launch boats from there can take you into Borrowdale. A lot of footpaths onto the fells start close by. If you drive, you can reach a fair bit of the national park within half an hour.
Facilities: WiFi, TV, dishwasher. Bedding and towels are included. There's a cot and a highchair. No pets.
Useful links: Lake District National Park and National Trust Lake District.