Stayed at the Marriott's Regents Park for 8 days. The staff were warm and helpful, the location is reasonably convenient (however, make sure you have the address with you when you're taking taxis - the hotel is not actually in Regents Park, so we had to clarify the hotel location with several taxi drivers as we traveled around London and headed back to the hotel). The hotel is of decent quality and our room was spacious, but here are the reasons why I don't rate it higher than Average: We stayed on the "Penthouse" level - for the rooms on this floor, you cannot turn the bathroom fan off - ever. The fans are on an interconnected system (we even had maintenance up to the room because we thought the fan was broken when it kept running - the maintenance guy is the one who told us about the system on this floor - apparently the interconnected system is only on the Penthouse level). We had to sleep with the bathroom door shut - and even then, you could still hear the fan in the room, but we eventually got used to it. Also, the light switch for the bathroom is located next to the door to the room - and the bathroom door is not near the room entrance. When you need to use the bathroom, you need to walk 10 steps from the bathroom to the room door,...Stayed at the Marriott's Regents Park for 8 days. The staff were warm and helpful, the location is reasonably convenient (however, make sure you have the address with you when you're taking taxis - the hotel is not actually in Regents Park, so we had to clarify the hotel location with several taxi drivers as we traveled around London and headed back to the hotel). The hotel is of decent quality and our room was spacious, but here are the reasons why I don't rate it higher than Average: We stayed on the "Penthouse" level - for the rooms on this floor, you cannot turn the bathroom fan off - ever. The fans are on an interconnected system (we even had maintenance up to the room because we thought the fan was broken when it kept running - the maintenance guy is the one who told us about the system on this floor - apparently the interconnected system is only on the Penthouse level). We had to sleep with the bathroom door shut - and even then, you could still hear the fan in the room, but we eventually got used to it. Also, the light switch for the bathroom is located next to the door to the room - and the bathroom door is not near the room entrance. When you need to use the bathroom, you need to walk 10 steps from the bathroom to the room door, hit the bathroom light switch and then reverse the process when you're done. Quite annoying in the middle of the night. We didn't try to switch rooms because we didn't want to face the possibility of getting a smaller room because the room was a good size. I booked a room with a sleeper sofa to accommodate my husband and I in a King bed along with a separate bed for our college-aged daughter - when we asked for the sofa bed to be made up for her, they brought in a roll-away bed, rather than making up the sofa. Because the room was large enough to accommodate the extra bed (and she was used to sleeping on a small dorm bed anyway - plus see my next comment) we didn't request any changes, but it was odd that they didn't even attempt to make the sofa bed. The room had one wall of windows - which was nice for the view, but the window leaked when a big rain (which is not uncommon in London) hit our first night - the maintenance guy told us the windows had just (within the last month or so) been re-done because of leaks - evidently the problem wasn't quite fixed. The sofa was next to the window, with the roll-away on the opposite side, so the roll-away bed saved my daughter from the rain leaking from the window and...More