Hello. I am renting an apartment for 3 nights in mid-April with my husband and his parents. His parents are in their 60s, and though able, don't like to walk long distances (20-30 minutes max at a time). We are staying in an area called the Cowgate on Bell's Wynd in Old Town. Are the major sites within walking distance? Is it a lot of uphill or uneven streets? TIA.